Introduction

Dieffenbachia seguine, commonly known as Dumbcane, is a popular houseplant prized for its striking variegated foliage. This tropical beauty is relatively easy to care for, making it a suitable choice for both novice and experienced plant enthusiasts. However, it’s important to be aware of its toxic nature, as its sap can cause skin irritation and other health issues if ingested.

Plant Description

Dieffenbachia seguine is an herbaceous perennial with large, paddle-shaped leaves that feature cream, white, and yellow patches. It can grow up to 5 feet tall indoors and even larger outdoors in warm climates. While it prefers indirect light, it can tolerate lower light conditions, although the variegation may be less pronounced.

Care Requirements

Light: Dieffenbachia seguine thrives in bright, indirect light, similar to the filtered light it receives on the rainforest floor. Avoid placing it in direct sunlight, as this can scorch the leaves.

Soil: A well-draining, loamy potting soil is ideal for Dieffenbachia seguine. It provides a balance of nutrients, aeration, and moisture retention.

Water: Watering is crucial for Dieffenbachia seguine’s health. Water the plant thoroughly when the top inch of soil feels dry to the touch. Avoid overwatering, as soggy soil can lead to root rot. Adjust the watering frequency based on the plant’s size and your home’s conditions.

Temperature and Humidity: Dieffenbachia seguine prefers warm temperatures between 65 and 75°F. It can tolerate temperatures as low as 55°F, but avoid exposing it to cold drafts. Provide higher-than-average humidity levels to encourage healthy growth.

Fertilizer: During the growing season, fertilize Dieffenbachia seguine monthly with a balanced, liquid fertilizer diluted to half-strength. Avoid overfertilizing, as this can damage the plant.

Pruning

Pruning is not essential for Dieffenbachia seguine, but it can help maintain a desired size and shape. Remove any dying, damaged, or dead foliage to promote healthy growth. If the plant becomes leggy or top-heavy, you can prune the stems back to encourage bushier growth.

Propagation

Dieffenbachia seguine is easily propagated by stem cuttings or root division. Wear gloves during propagation, as the plant’s sap can cause skin irritation.

Stem Cuttings: Take stem cuttings in the spring. Remove the leaves from the lower portion of the stem and dip the cutting into rooting hormone. Plant the cutting horizontally in a well-draining potting medium and keep the soil moist. Roots should develop within four weeks.

Root Division: Divide the plant in the spring or when repotting. Gently remove the plant from its pot and separate the stems, ensuring each section has ample roots attached. Plant the separated stems in their own containers filled with fresh potting mix.

Repotting

Dieffenbachia seguine grows quickly and may need to be repotted every year or two. Signs that the plant is rootbound include roots poking out of the drainage holes and water pouring straight through the soil. Choose a pot that is about two inches larger in diameter than the existing one. Use a fresh, nutrient-rich, well-draining potting mix when repotting.

Common Problems

Yellow Leaves: Yellow leaves can indicate overwatering, lack of nutrients, insufficient light, or pests. Adjust the watering schedule, fertilize regularly, and move the plant to a brighter location.

Leggy Growth: Leggy growth is often a sign of insufficient light. Move the plant to a brighter spot and consider pruning to encourage a more compact shape.

Drooping Leaves: Drooping leaves can be caused by overwatering, underwatering, or cold temperatures. Adjust the watering schedule or move the plant to a warmer location.

Fading Variegation: Fading variegation is usually due to insufficient light. Move the plant to a position where it receives more bright, indirect light.

Toxicity

Dieffenbachia seguine is toxic to both humans and pets. If ingested, it can cause skin irritation, digestive problems, and respiratory distress. Keep the plant out of reach of children and animals. Wear gloves when handling the plant, and wash your hands thoroughly afterwards.

Eye-Catching Blooms for Your Garden

Envision a garden adorned with colossal flowers that command attention and elicit awe. From towering sunflowers to ethereal moonflowers, this article presents an array of plants that boast blooms of extraordinary size and beauty.

Sun-worshipping Giants: Sunflowers and Dahlias

Sunflowers (Helianthus annuus) reign supreme when it comes to gargantuan blooms. Varieties like ‘Mammoth’ and ‘Sunzilla’ produce immense flower heads up to 16 inches in diameter, a testament to the sun’s nurturing power.

Dinner-plate dahlias (Dahlia spp.) are another sun-loving spectacle. These hybrids showcase blooms that measure at least 8 inches across, their petals adorned with vibrant hues ranging from white to purple and crimson.

Exotic Blooms: Cockscomb and King Protea

Cockscomb (Celosia argentea var. cristata) captivates with its otherworldly, coral-shaped inflorescences. Its velvety texture and footlong size make it an unforgettable addition to any flower bed.

King protea (Protea cynaroides) hails from South Africa, producing the largest flower heads of any protea species. These artichoke-like blooms can reach up to a foot in diameter, adding an exotic flair to any tropical arrangement.

Fragrant and Showy: Hydrangeas and Oriental Poppies

Hydrangeas (Hydrangea spp.) are renowned for their voluminous flower clusters, which can span up to 12 inches in diameter. Varieties like ‘Annabelle’ and ‘Incrediball’ offer stunning shades of blue, pink, purple, and white.

Oriental poppies (Papaver orientale) burst forth in late spring with extra-large blooms that often exceed 7 inches in diameter. Their ruffled petals come in a kaleidoscope of colors, including red, orange, pink, and purple.

Towering Beauties: Delphiniums and Globemaster Allium

Pacific Giant delphiniums (Delphinium elatum ‘Pacific Giant’) produce towering flower spikes adorned with 3-inch double flowers. These stately plants reach heights of up to 7 feet, making them a focal point in any border.

Globemaster alliums (Allium ‘Globemaster’) are another vertical wonder. Their massive flower heads, up to 10 inches in diameter, form striking orbs atop 3-foot stalks.

Versatile Bloomers: Hardy Hibiscus and English Roses

Hardy hibiscus (Hibiscus moscheutos) defies the odds by surviving cold winters in USDA zones 4-5. Its captivating flowers, which can exceed 10 inches in diameter, come in a range of colors, including white, pink, and blue.

English roses (Rosa molineux) are a class of roses developed by David Austin, known for their large, full blooms and heady fragrances. Varieties like ‘Charles Darwin’ and ‘Spirit of Freedom’ produce countless petals and bloom repeatedly throughout the season.

Night-Blooming Enchantments: Sacred Lotus and Moonflower

Sacred lotus (Nelumbo nucifera) is an aquatic plant native to Asia. Its ethereal flowers, up to a foot in diameter, float gracefully above the water’s surface. While short-lived, these blooms offer a captivating spectacle for two to three months.

Moonflower (Ipomoea alba) is a nocturnal vine that unfurls its 6-inch white trumpet-shaped flowers at dusk. Its enchanting fragrance and unique blooming habit make it a favorite among night-garden enthusiasts.

Additional Large-Flowered Plants to Consider

• Orienpet lilies (Lilium OT): Hybrids of trumpet and Oriental lilies, featuring fragrant blooms up to 15 inches in diameter.
• Bigleaf magnolia (Magnolia macrophylla): The largest-flowered of all magnolias, with blooms spanning up to 10 inches wide.
• Camellia (Camellia japonica): Southern gardeners delight in the charm of camellias, producing flowers up to 6 inches in diameter in a variety of colors.
• Amaryllis (Hippeastrum group): Popular holiday plants with large, trumpet-shaped flowers in a range of colors.
• Angel’s trumpet (Brugmansia): Tropical shrubs or small trees with large, hanging trumpet-shaped flowers that can be toxic to humans and animals.
• California giant zinnia (Zinnia elegans): Heat-tolerant and deer-resistant, these zinnias produce 4- to 6-inch flowers in a vibrant array of colors.

Enhance Your Garden with Large Flowers

These extraordinary plants offer a captivating display of size and beauty, transforming any garden into a breathtaking oasis. Whether you seek towering blooms, exotic shapes, or fragrant wonders, this curated selection provides endless possibilities to create a garden that is both awe-inspiring and unforgettable.

Early Life and Education

Kono Yasui, born in 1870, grew up in a supportive environment that encouraged her intellectual curiosity. Her parents instilled in her the belief that she was equal to men, and she excelled in her studies. Despite the limited educational opportunities for girls in Japan at the time, Yasui found ways to pursue her passion for science. She attended Kagawa Prefecture Normal School and then Tokyo Women’s Higher Normal School (TWHNS), where she became the first woman to publish in a Japanese science journal.

Scientific Research

After graduating from TWHNS, Yasui embarked on her own research in plant cytology. She conducted groundbreaking studies on the life cycle of water ferns and published her findings in prestigious international journals. Despite facing skepticism and discrimination as a woman in science, Yasui persevered and made significant contributions to the field. She discovered six ancient plant species, including a species of Sequoia.

Challenges and Compromises

Yasui’s path as a female scientist was not without challenges. She had to overcome deeply embedded cultural assumptions that women were not capable of scientific success. To gain support for her overseas studies, she agreed to add “research in home economics” to her area of study and to remain unmarried. These compromises reflected the gendered expectations of the time, but Yasui refused to let them define her.

Doctoral Degree and Career

In 1927, Tokyo Imperial University awarded Yasui a doctoral degree in science, making her the first Japanese woman to earn a PhD in the field. She continued her research and teaching at TWHNS, where she became a respected professor. Yasui advocated for women’s higher education and played a key role in establishing TWHNS as a national research university for women.

Ambivalence and Legacy

Yasui’s views on how to achieve gender equality were complex. While she campaigned for women-centered research institutions, she rejected the idea of women-only scientific societies. She believed that such groups reinforced the notion that women’s work was inferior. Yasui’s ambivalence was likely influenced by her own experiences, in which she had achieved success by rejecting traditional Japanese standards for women.

Despite her conflicting ideas, Yasui’s legacy is one of empowerment for women in science. She broke ground in both research and teaching, inspiring future generations of female scientists. Her contributions to the field of plant cytology and her efforts to promote women’s education paved the way for a more inclusive and equitable scientific community in Japan.

Introduction

Oxalis, a diverse genus of plants, captivates with its unique leaf forms and vibrant blooms. Whether adorning gardens or flourishing as houseplants, these captivating beauties offer a wealth of visual interest. This comprehensive guide will delve into the intricacies of Oxalis cultivation, providing essential insights for nurturing these charming plants.

Plant Description and Varieties

Oxalis, belonging to the Oxalidaceae family, encompasses over 550 species. Their diminutive stature and distinctive leaves, resembling clover or butterfly wings, set them apart. Depending on the species, foliage may boast three to five leaflets, often adorned with captivating notches.

The genus Oxalis exhibits remarkable diversity, with species adapted to a wide range of environments. Woodland varieties thrive in shady understories, while alpine species flourish in mountainous regions. Tropical Oxalis, known for their showy blooms, prefer warm and humid conditions.

Cultivation Requirements

Light:

Light requirements vary among Oxalis species. Tropical varieties tolerate more direct sunlight, while most species grown in temperate zones prefer bright, indirect light with afternoon shade. Excessive heat can lead to poor performance.

Soil:

Oxalis thrives in fertile, well-draining soil with a slightly acidic pH. Amend garden soil with compost or organic matter to enhance fertility. For potted plants, use a mix of indoor potting soil, sand, or grit to ensure proper drainage.

Water:

Oxalis prefers dry conditions and can quickly decline in soggy soil. Water every 1 to 2 weeks, allowing the soil to dry out between waterings. Tropical species may require more frequent watering. During dormancy, withhold water to prevent corm rot.

Temperature and Humidity:

Ideal temperature and humidity levels depend on the species. Tropical varieties tolerate higher temperatures, while other Oxalis species prefer temperatures between 60 and 75 degrees Fahrenheit. Tropical species may require additional humidity when grown as houseplants.

Fertilization:

Oxalis benefits from soil enriched with compost or organic nutrients. Alternatively, apply a slow-release fertilizer at the start of the growing season. Fertilize houseplants monthly with a diluted, all-purpose liquid fertilizer. Discontinue feeding during dormancy.

Propagation and Repotting

Propagation:

Oxalis corms multiply rapidly, making division an easy propagation method. Dig up clumps of Oxalis in early spring and separate corms with roots and green shoots. Replant divisions just below the soil surface.

Repotting:

Potted Oxalis should be repotted annually or moved into a larger container as needed. Gently remove the plant from its current pot and replant it in a larger pot with fresh potting mix.

Overwintering

In temperate zones, outdoor Oxalis can be brought indoors when nighttime temperatures drop below 50 degrees Fahrenheit. Keep potted plants in an unheated basement or garage and allow them to go dormant. Withhold water and fertilizer.

Common Pests and Diseases

Oxalis can be susceptible to spider mites and leafminers. Apply neem oil as a preventive measure or treat with a pesticide specifically for leafminers. Fungal infections, such as mildew, leaf spots, and rust, can also affect Oxalis. Treat with appropriate fungicides.

Encouraging Blooms

For Oxalis to bloom, it requires a period of dormancy. Withhold water and fertilizer during this time to trigger bloom production. Selecting species native to your growing zone also increases the likelihood of flowering.

Troubleshooting Common Problems

Failure to Bloom:

• Ensure the plant has undergone a period of dormancy.
• Select species hardy to your growing zone.

Leggy Appearance:

• Move the plant to a brighter location or remove adjacent foliage blocking light.
• Consider the possibility of the plant entering dormancy.

Additional Tips

• Oxalis attracts butterflies and other pollinators.
• Some Oxalis species are considered invasive, so check with your local cooperative extension agent before planting outdoors.
• Many Oxalis species can be grown as houseplants, providing a touch of greenery indoors.
• Oxalis foliage is edible and often used in salads or as a garnish.

The Fear of the Tomato in Europe

In the late 18th century, tomatoes were widely feared in Europe. They were known as “poison apples” because it was believed that aristocrats fell ill and died after eating them. However, the real cause of these deaths was lead poisoning, as wealthy Europeans used pewter plates high in lead content. The acidic nature of tomatoes leached lead from the plates, resulting in lead poisoning.

Despite the lack of evidence linking tomatoes to poisoning, the fear persisted for over 200 years. This was partly due to the tomato’s classification as a deadly nightshade, a family of poisonous plants containing toxins called tropane alkaloids.

The Tomato’s Arrival in America

Tomatoes were first introduced to North America by Spanish conquistadors in the 16th century. However, they were initially grown only for ornamental purposes due to the belief that they were poisonous.

In the 18th century, tomatoes began to be eaten in some regions of America, but fears and rumors about their potential toxicity lingered. The Green Tomato Worm, a large green worm with a horn on its back, was believed to be deadly to humans.

The Tomato’s Redemption

Despite the lingering fears, tomatoes gradually gained acceptance as a food source. By the 19th century, hundreds of tomato recipes appeared in local periodicals and newspapers. Farmers began experimenting with different varieties of tomatoes and investigating their use.

In the 1850s, the name “tomato” became so highly regarded that it was used to sell other plants at market. By 1897, Joseph Campbell invented condensed tomato soup, which further popularized the fruit.

The Tomato Today

Today, tomatoes are consumed around the world in countless varieties. They are used in a wide range of dishes, from salads to pizzas to soups. In 2009, the United States alone produced 3.32 billion pounds of fresh-market tomatoes.

Despite the tomato’s widespread popularity, some of its nightshade past seems to have followed it into pop culture. The 1978 musical drama/comedy “Attack of the Killer Tomatoes” features giant red blobs of the fruit terrorizing the country.

The Tomato’s Legacy

The tomato has a long and fascinating history, marked by both fear and fascination. From its humble beginnings as a deadly nightshade to its current status as a culinary delight, the tomato has come a long way.

Its journey serves as a reminder that even the most feared and misunderstood things can eventually become widely accepted and enjoyed.

What are corms, bulbs, tubers, and rhizomes?

Corms, bulbs, tubers, and rhizomes are all underground plant stems that store nutrients for the plant to use later. They are all swollen and modified, but they have different structures and growth patterns.

• Corms are solid, rounded or oval underground stems that store nutrients. They have a papery outer layer and a central bud that will eventually become a flower. Corms do not have layers like bulbs. Examples of plants that grow from corms include crocuses, gladiolus, and cyclamen.

• Bulbs are underground stems that are made up of layers of fleshy leaves. The bottom of the bulb is a compacted stem, with roots growing from it. Layers of nutrient-filled leaves sit at the bottom of the bulb and surround a bud that eventually becomes a flower. Examples of plants that grow from bulbs include daffodils, hyacinths, and tulips.

• Tubers are swollen stems or roots that store nutrients. They have buds, or “eyes,” that can sprout into new plants. Tubers can be cut into pieces, and each piece can be planted to grow a new plant. Examples of plants that grow from tubers include potatoes, dahlias, and begonias.

• Rhizomes are modified, swollen stem-like structures that grow horizontally. They form roots from the bottom and send shoots upwards. Buds form at different parts along the rhizome, not just the tip. Examples of plants that grow from rhizomes include Japanese knotweed, lily-of-the-valley, and canna lily.

How to identify corms, bulbs, tubers, and rhizomes

Corms, bulbs, tubers, and rhizomes can be identified by their shape, structure, and growth pattern.

• Corms are solid and rounded or oval in shape. They have a papery outer layer and a central bud.
• Bulbs are made up of layers of fleshy leaves. They have a papery outer layer and a basal plate at the bottom.
• Tubers are swollen stems or roots. They have buds, or “eyes,” that can sprout into new plants.
• Rhizomes are modified, swollen stem-like structures that grow horizontally. They form roots from the bottom and send shoots upwards.

The role of corms, bulbs, tubers, and rhizomes in the ecosystem

Corms, bulbs, tubers, and rhizomes play an important role in the ecosystem. They provide food and shelter for wildlife, and they help to aerate the soil and improve drainage. Corms, bulbs, tubers, and rhizomes are also a valuable source of food for humans and animals.

The benefits of growing corms, bulbs, tubers, and rhizomes in the garden

Corms, bulbs, tubers, and rhizomes are a great addition to any garden. They are relatively easy to grow, and they provide a long season of blooms. Corms, bulbs, tubers, and rhizomes can also be used to create a variety of garden designs, from formal to informal.

Here are some of the benefits of growing corms, bulbs, tubers, and rhizomes in the garden:

• They are a great way to add color and interest to your garden.
• They are relatively easy to grow.
• They provide a long season of blooms.
• They can be used to create a variety of garden designs.
• They are a valuable source of food for humans and animals.
• They play an important role in the ecosystem.

If you are looking for a way to add beauty and interest to your garden, consider planting some corms, bulbs, tubers, or rhizomes. They are a great way to add color, variety, and ecological value to your landscape.

Overview

Blue potato bush, also known as Lycianthes rantonnetii, is a striking ornamental shrub prized for its vibrant purple-blue flowers and attractive foliage. Native to South America, this fast-growing evergreen is well-suited to USDA hardiness zones 8 through 11.

Characteristics

• Botanical Name: Lycianthes rantonnetii
• Common Name: Blue potato bush, Paraguay nightshade, royal robe
• Plant Type: Shrub
• Mature Size: 6-10 ft. height and width
• Flower Color: Purple-blue
• Bloom Time: March-October (or year-round in warmer areas)
• Growth Rate: Fast
• Toxicity: All parts of the plant are poisonous, including the inedible orange-red berries

Planting and Growing Conditions

Light: Blue potato bush prefers full sun but will tolerate partial shade in warmer areas.

Soil: Loamy soil should be well-drained and not allowed to completely dry out between waterings.

Water: Regular watering is important, particularly during the first growing season. Water more frequently during times of high heat.

Fertilizer: Apply a slow-release fertilizer in the spring just before new growth begins. If planted in a container, fertilize once a month with a liquid 10-10-10 fertilizer. Mulch roots with compost in the spring and again in the fall.

Pruning

Regular pruning is essential to maintain a pleasing shape and encourage continued blooming.

• Primary Pruning: Prune heavily in the winter months after blossoming has ceased.
• Light Pruning: Light pruning after each batch of flowers will result in a more compact shape and greater blossoming.
• Shaping: Blue potato bushes can be pruned into almost any shape, including tree shapes or topiary lollipops.

Propagation

Propagating blue potato bush from cuttings is relatively easy and safer than foraging seeds from the poisonous berries.

• Cuttings: Take cuttings from summer to early fall, and propagate with these steps:
  • Cut a stem of about 4 to 6 inches, cutting below a leaf node.
  • Remove leaves from the stem, leaving at least two at the top.
  • Dip the bottom of the stem in rooting hormone.
  • Insert the stem into well-draining soil.
  • Cover with a plastic bag or bottle.
  • Place the container in a warm area with bright sun.
  • Water well.
  • Cuttings will root in about a month.
• Seeds: Harvesting seeds from the berries is not recommended due to the plant’s toxicity.

Potting and Repotting

Blue potato bush can be grown in outdoor containers.

• Container Size: Choose a large pot to accommodate the plant’s height and width.
• Drainage: Line the bottom of the pot with gravel.
• Soil: Keep soil moist and well-drained.
• Light: Keep in a sunny spot outdoors.
• Pruning: Prune lower branches and remaining foliage to the desired shape to train the bush into a tree or espalier.

Overwintering

If blue potato bushes are potted, bring them indoors when the threat of frost arrives. Gradual movement from outdoors to indoors is recommended to avoid stress.

Common Pests and Diseases

Blue potato bush is susceptible to pests such as aphids, caterpillars, and thrips. It may also suffer from blight, damping-off, stem rot, powdery mildew, gray mold, and viruses.

Additional Tips

• Use blue potato bush as a backdrop for smaller shrubs and perennials or as a focal point in a garden.
• Mix it with other plants as a border or grow it in containers for a striking display on a patio.
• Plant in well-drained soil to avoid root rot.
• Protect young plants from strong winds.
• Mulch around the base of the plant to retain moisture and suppress weeds.
• Avoid planting where children or pets may be exposed to the poisonous berries.