Top 20 Plants That Start With I

Are you a passionate gardener looking for fresh ideas to spice up your garden? 

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Perhaps you've already tried all the common flowers and plants, and now you're eager for something new and exciting. 

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Don’t worry! In the following article, we will introduce a list of plants starting with “i” which will breathe new life into your garden.

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Ixia (Corn Lily)

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  • Plant Type: Perennial
  • Bloom Time: Spring
  • Sun Exposure: Full Sun
  • Soil Requirement: Well-drained
  • USDA Hardiness Zones: 7-10
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Native to South Africa, Ixia owns grass-like leaves and striking star-shaped flowers.

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Growing Ixia is a breeze. You can simply plant the bulbs in autumn, about 3 inches deep and spaced 4 inches apart. They will reward you with red, yellow, pink, or white blooms in spring. 

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To keep your Ixia looking its best, deadhead spent flowers to encourage more blooms and watch out for common pests like aphids and slugs.

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In addition, Ixia attracts pollinators like bees and butterflies. Whether used in borders, rock gardens, or containers, it is sure to bring joy and vibrant color to your gardening space.

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Iris

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  • Plant Type: Perennial
  • Bloom Time: Spring to Early Summer
  • Sun Exposure: Full Sun to Partial Shade
  • Soil Requirement: Moist, Well-drained
  • USDA Hardiness Zones: 3-9
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Iris has sword-like foliage and a rainbow of flower colors ranging from blue and purple to yellow and white.

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To grow iris, you should plant the rhizomes in late summer or early autumn, ensuring the tops are just above the soil surface. Space them about 12-24 inches apart to allow room for growth.

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Iris is perfect for borders, rock gardens, and even as cut flowers for indoor arrangements. 

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To keep your irises healthy, divide the clumps every 3-4 years to prevent overcrowding. 

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Impatiens (Busy Lizzie)

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  • Plant Type: Annual
  • Bloom Time: Spring to Fall
  • Sun Exposure: Partial to Full Shade
  • Soil Requirement: Moist, Well-drained
  • USDA Hardiness Zones: 10-11 (often grown as an annual in cooler zones)
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Impatiens are beloved for pink, red, white, and purple blooms. With their lush, green foliage and abundant flowers, they are perfect for adding color to low-light spots in your garden.

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You can plant impatiens in spring after the danger of frost has passed. Space the plants about 8-12 inches apart to allow for proper airflow and growth.

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For best results, feed your Impatiens with a balanced, water-soluble fertilizer every few weeks and watch out for aphids and spider mites.

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Impatiens are ideal for garden beds, borders, containers, and hanging baskets.

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Indian Paintbrush

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  • Plant Type: Perennial
  • Bloom Time: Spring to Summer
  • Sun Exposure: Full Sun
  • Soil Requirement: Well-drained
  • USDA Hardiness Zones: 3-8
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Indian paintbrushes have bright red, orange, or yellow bracts that resemble a paintbrush dipped in vibrant colors. 

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These plants are semi-parasitic, meaning they attach their roots to neighboring plants to access additional nutrients. 

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To grow them successfully, you need to plant seeds in late fall or early spring, preferably near a host plant like grass or sagebrush.

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Indian Paintbrush is relatively low-maintenance, but watch for pests like aphids and diseases like powdery mildew. 

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This plant is excellent for wildflower gardens, meadows, and naturalized areas, adding a splash of color and attracting bees and hummingbirds.

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Ice Plant

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  • Plant Type: Perennial, Succulent
  • Bloom Time: Spring to Summer
  • Sun Exposure: Full Sun
  • Soil Requirement: Sandy, Well-drained
  • USDA Hardiness Zones: 5-9
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Ice plant has daisy-like flowers with various colors and succulent foliage. The leaves have a unique, frosty appearance that looks as though they are covered in tiny ice crystals.

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You should plant it in the spring, spacing the plants about 12 inches apart to allow for growth and good air circulation. 

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Water sparingly, as ice plants are drought-tolerant and prefer slightly dry conditions. So, they are perfect for rock gardens, borders, and ground covers. 

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Ice plants are also a fantastic choice for erosion control due to their spreading habit.

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Ipomoea (Morning Glory)

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  • Plant Type: Annual or Perennial Vine
  • Bloom Time: Summer to Fall
  • Sun Exposure: Full Sun
  • Soil Requirement: Well-drained
  • USDA Hardiness Zones: 9-11 (Annual in cooler zones)
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Native to tropical America, ipomoea has trumpet-shaped flowers in blue, purple, pink, and white unfurling in the morning sunlight.

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When growing ipomoea, you should plant seeds directly in the garden after the last frost, or start them indoors a few weeks earlier. 

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Provide a trellis or support for the vines to climb, and watch them quickly cover fences, pergolas, and trellises with their lush foliage and vibrant flowers.

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Ipomoea requires regular watering, especially during dry spells. It is perfect for adding vertical interest to your garden and attracts pollinators.

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Ixora (Flame of the Woods)

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  • Plant Type: Evergreen Shrub
  • Bloom Time: Year-round
  • Sun Exposure: Full Sun to Partial Shade
  • Soil Requirement: Well-drained, Slightly Acidic
  • USDA Hardiness Zones: 10-12
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Ixora has dense clusters of small, tubular flowers in vibrant shades of red, orange, pink, and yellow.

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You should plant ixora in a sunny spot, ensuring it gets at least 4-6 hours of sunlight daily. Remember to water regularly and mulch around its base.

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Ixora benefits from regular feeding with a balanced, slow-release fertilizer to encourage continuous blooming.

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This versatile shrub is ideal for hedges, borders, and foundation plantings. It can also be grown in containers, making it a great choice for patios and balconies. 

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Iberis (Candytuft)

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  • Plant Type: Perennial
  • Bloom Time: Spring
  • Sun Exposure: Full Sun
  • Soil Requirement: Well-drained, Alkaline to Neutral
  • USDA Hardiness Zones: 3-9
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Iberis has beautiful clusters of white, pink, or purple flowers. Native to Europe, this low-growing plant is perfect for borders, rock gardens, and as ground cover.

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You should plant iberis in the fall or early spring, spacing the plants about 12 inches apart to allow for good air circulation. 

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Every few years, divide the clumps to prevent overcrowding and promote healthy growth. Iberis is relatively pest-free but watch out for root rot in poorly drained soils.

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Inula (Elecampane)

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  • Plant Type: Perennial
  • Bloom Time: Summer
  • Sun Exposure: Full Sun
  • Soil Requirement: Moist, Well-drained
  • USDA Hardiness Zones: 3-8
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Inula owns large, bright yellow, daisy-like flowers. Ite can grow quite tall up to 6 feet, making it an excellent choice for the back of borders.

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To plant inula, choose a sunny spot in your garden and space the plants about 18-24 inches apart. 

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Elecampane is low-maintenance but benefits from a balanced fertilizer. Deadhead spent flowers to encourage continuous blooming and cut back the stems in late fall to prepare for winter. 

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Traditionally, its roots are known for their expectorant properties and are often used to treat respiratory conditions. 

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Isotoma (Blue Star Creeper)

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  • Plant Type: Perennial
  • Bloom Time: Summer to Fall
  • Sun Exposure: Full Sun to Partial Shade
  • Soil Requirement: Well-drained, Moist
  • USDA Hardiness Zones: 6-9
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Isotoma is a low-growing plant and native to Australia. It has tiny, delicate flowers that bloom from summer to fall.

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When growing these plants, you should space about 12 inches apart to allow them to spread and form a dense mat. 

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Isotoma requires minimal care. Sometimes you can trim the plants lightly to maintain their shape and encourage new growth. 

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Blue Star Creeper is ideal for creating a lush, flowering ground cover that can handle light foot traffic, making it perfect for paths and walkways. 

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It also looks stunning in rock gardens, borders, and as a filler between pavers. 

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Ipheion (Spring Starflower)

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  • Plant Type: Perennial Bulb
  • Bloom Time: Spring
  • Sun Exposure: Full Sun to Partial Shade
  • Soil Requirement: Well-drained, Slightly Acidic to Neutral
  • USDA Hardiness Zones: 5-9
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Ipheion is a perennial bulb owning star-shaped flowers in shades of blue, white, and occasionally pink. 

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You should plant the bulbs in the fall, about 2-3 inches deep and spaced 3-4 inches apart, in well-drained, slightly acidic to neutral soil. 

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Remember to water ipheion regularly during the growing season and fertilize with a balanced, slow-release fertilizer in early spring.

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Spring Starflower is perfect for borders, rock gardens, and naturalizing in lawns or under deciduous trees. Its early blooms provide much-needed color after winter and attract pollinators like bees. 

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Isoplexis (Canary Island Foxglove)

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  • Plant Type: Shrub
  • Bloom Time: Summer
  • Sun Exposure: Full Sun
  • Soil Requirement: Well-drained
  • USDA Hardiness Zones: 9-11
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Native to the Canary islands, isoplexis features tall spikes of tubular, orange-yellow flowers that bloom in the summer and dark green, lance-shaped leaves.

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You can plant isoplexis in the spring, spacing the plants about 18-24 inches apart to allow for growth and airflow. 

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To keep your isoplexis healthy and blooming, feed it with a balanced fertilizer in early spring. Prune after flowering to maintain its shape and encourage new growth.

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Isoplexis is perfect for adding vertical interest to borders and garden beds. Its vibrant flowers attract pollinators enhancing the biodiversity of your garden. 

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Indigofera (Indigo Plant)

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  • Plant Type: Perennial Shrub
  • Bloom Time: Spring to Summer
  • Sun Exposure: Full Sun
  • Soil Requirement: Well-drained
  • USDA Hardiness Zones: 6-10
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Indigofera owns graceful, arching stems adorned with pinnate leaves and clusters of pink to purple pea-like flowers. 

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You should plant indigofera in the spring, spacing the shrubs about 3 feet apart to allow for ample growth. Once established, it requires minimal maintenance.

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Indigofera is not only a visual treat but also attracts bees and butterflies. Additionally, it can be used for natural dyeing, offering a unique and sustainable way to add color to fabrics.

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Incarvillea (Hardy Gloxinia)

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  • Plant Type: Perennial
  • Bloom Time: Late Spring to Summer
  • Sun Exposure: Full Sun to Partial Shade
  • Soil Requirement: Well-drained, Fertile
  • USDA Hardiness Zones: 5-9
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 Native to Asia, particularly China, incarvillea owns trumpet-shaped, vibrant pink to red flowers and lush, fern-like foliage adding colors to borders and garden beds from late spring to summer.

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To plant incarvilleas, choose a spot that receives at least 4-6 hours of sunlight daily. Space them about 12-18 inches apart to allow for good air circulation.

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Also, you need to deadhead spent flowers and feed with a balanced fertilizer in early spring to ensure continuous blooming.

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With  bright flowers, hardy gloxinia can attract pollinators and is perfect for borders, rock gardens, and containers.

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Illicium (Star Anise)

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  • Plant Type: Evergreen Shrub
  • Bloom Time: Spring to Summer
  • Sun Exposure: Full Sun to Partial Shade
  • Soil Requirement: Moist, Well-drained
  • USDA Hardiness Zones: 7-10
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Illicium has glossy, aromatic leaves and star-shaped flowers. Native to East Asia and North America, it is well-suited to many garden settings from shady woodland gardens to sunny borders.

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You should plant illicium in a spot that receives morning sun and afternoon shade for best results. 

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To keep your Illicium looking its best, apply a balanced fertilizer in early spring and prune lightly after flowering to maintain its shape. 

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Illicium is perfect for creating a fragrant hedge. In addition, the leaves and seeds of some illicium species are used to treat toothache and dermatitis topically.

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Ilex (Holly)

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  • Plant Type: Evergreen or Deciduous Shrub/Tree
  • Bloom Time: Spring
  • Sun Exposure: Full Sun to Partial Shade
  • Soil Requirement: Well-drained, Acidic to Neutral
  • USDA Hardiness Zones: 5-9
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Native to temperate and subtropical regions worldwide, ilex includes a variety of species ranging from small shrubs to large trees with glossy, spiny leaves and bright red berries.

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To plant holly, choose a location with good air circulation and space the plants according to their mature size. Also, water regularly, especially during the first few years to establish a strong root system.

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Holly is perfect for hedges, foundation plantings, and as a standalone specimen. Its bright berries attract birds, adding life to your garden, especially in winter. 

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The branches with berries are often used in holiday decorations, bringing a festive touch to homes.

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Iresine (Bloodleaf)

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  • Plant Type: Perennial
  • Bloom Time: Year-round (grown primarily for foliage)
  • Sun Exposure: Full Sun to Partial Shade
  • Soil Requirement: Well-drained, Fertile
  • USDA Hardiness Zones: 10-11 (often grown as an annual in cooler zones)
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Native to tropical regions of America, iresine owns vibrant red, pink, and purple foliage.

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For the best color, plant iresines in a spot that receives bright, indirect light. Also, space them about 12-18 inches apart to allow for growth and airflow.

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While the plants are generally pest-free, watch for aphids and spider mites and treat them promptly if they appear.

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Iresine is perfect for adding color to garden beds, borders, and containers. Its striking foliage makes it an excellent accent plant, and it pairs beautifully with other annuals and perennials. 

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Idesia (Wonder Tree)

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  • Plant Type: Deciduous Tree
  • Bloom Time: Spring
  • Sun Exposure: Full Sun to Partial Shade
  • Soil Requirement: Well-drained, Fertile
  • USDA Hardiness Zones: 6-9
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Idesia has broad, heart-shaped leaves, fragrant yellow-green flowers, and striking clusters of red berries in the fall. Native to East Asia, it can grow up to 50 feet tall to provide shade and ornamental interest.

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You should plant idesia in the spring or fall with enough space to grow to its full potential. Water regularly, especially during the first few years, to establish a strong root system.

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Besides, you can fertilize it in early spring with a balanced fertilizer to promote healthy growth. Prune in late winter to shape the tree as desired.

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Isatis (Woad)

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  • Plant Type: Biennial or Perennial
  • Bloom Time: Spring
  • Sun Exposure: Full Sun
  • Soil Requirement: Well-drained, Alkaline to Neutral
  • USDA Hardiness Zones: 4-8
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Native to Europe and Western Asia, isatis  is hardy and adaptable to various growing conditions. It boasts bright yellow flowers in spring and attractive seed pods.

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To plant isatis, sow seeds directly into the garden in early spring or late fall. Thin the seedlings to about 12 inches apart to allow for proper growth. 

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Additionally, its leaves can be harvested to produce a natural blue dye, and its flowers attract beneficial insects like bees and butterflies. 

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Ismene (Spider Lily)

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  • Plant Type: Perennial Bulb
  • Bloom Time: Late Spring to Early Summer
  • Sun Exposure: Full Sun to Partial Shade
  • Soil Requirement: Well-drained, Fertile
  • USDA Hardiness Zones: 8-11
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Native to the Andes mountains of Peru, ismene owns striking, spidery white flowers with delightful fragrance and lush, strap-like foliage.

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When planting ismene, choose a sunny spot in your garden and plant the bulbs about 4 inches deep and 8 inches apart. 

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Besides, you should use a balanced fertilizer during the growing season to encourage prolific blooming. After the flowers have faded, allow the foliage to die back naturally to nourish the bulbs for the next season. 

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In colder climates, dig up the bulbs before the first frost and store them in a cool, dry place until the following spring.

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