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Iberis sempervirens
Perennial Candytuft
Iberis sempervirens
Iberis sempervirens, commonly known as Evergreen Candytuft, is a low-growing, spreading, evergreen sub-shrub belonging to the Brassicaceae family. It is prized for its spectacular floral display in late spring to early summer, when the dark green, leathery foliage is almost completely obscured by a dense blanket of pure white, four-petaled flowers. This plant typically forms a mounding ground cover, making it an excellent choice for rock gardens, border fronts, retaining wall edges, and cascading over walls. It is highly valued for its drought tolerance once established and its ability to thrive in full sun and well-drained, even poor, soils.
CategoryDetails
Plant TypePerennial plant
Estimated Plant Lifespan10 years lifespan
Toxic to humansToxic to humans
ToxicityToxic to: dogs, cats, horses
Sun Requirements6+ hours direct sunlight (Full Sun)
Pollination

Method: animal

Notes: Flowers attract bees, butterflies, and other pollinating insects. Pollination is generally not a concern for home gardeners as the plant is grown for its ornamental value.

Watering Requirements

Method: Top water

Frequency: Water deeply but infrequently, allowing the soil to dry out completely between waterings. It is very drought-tolerant once established.

Notes: Excellent drainage is absolutely critical. Avoid overwatering, as wet feet will lead to crown and root rot, especially during winter.

Humidity Requirements

Level: low

Maintenance: No special maintenance is needed. Prefers good air circulation which helps prevent fungal diseases.

Care InstructionsAfter the main blooming period finishes, shear the entire plant back by about one-third. This pruning encourages dense, bushy growth, prevents the center from becoming woody and bare, and may stimulate a second, lighter bloom.
Temperature Range

Min: -40°C

Max: 35°C

Cultivars

Phlox subulata
moss phlox
Phlox subulata
Creeping Phlox shares a similar low-growing, mat-forming habit and thrives in the same full-sun, well-drained conditions as Candytuft. Their blooming times often overlap, creating a stunning carpet of white and pastel colors in the spring garden.
Lavandula angustifolia
Common Lavender
Lavandula angustifolia
Lavender's silvery-grey foliage and upright flower spikes provide a beautiful texture and color contrast to the dark green leaves and mounding form of Candytuft. Both plants demand full sun and excellent drainage, making them perfect partners in a low-water garden.
Hosta sieboldiana
Siebold's Plantain Lily
Hosta sieboldiana

Hostas have opposite growing requirements. They thrive in shade and consistently moist, rich soil, whereas Iberis sempervirens requires full sun and dry, well-drained soil. Planting them together would result in poor health for one or both plants.

Astilbe chinensis
Tall false-buck's-beard
Astilbe chinensis

Astilbe requires partial to full shade and consistently moist to wet soil to flourish. These conditions would quickly cause root rot and death for the drought-loving Iberis sempervirens.

Aphids

Small, sap-sucking insects that cluster on new growth and flower buds. Infestations can cause stunted, distorted growth and a sticky residue called honeydew, which can lead to sooty mold.

Spider Mites

Tiny arachnids that are difficult to see with the naked eye. They thrive in hot, dry conditions and suck plant fluids, causing fine, pale stippling on the leaves. Severe infestations produce visible webbing.

Clubroot

A fungal disease that affects plants in the cabbage family (Brassicaceae). It causes the roots to swell and become distorted, hindering water and nutrient uptake, leading to stunted growth, wilting, and eventual plant death.

Flea Beetles

Small, dark beetles that jump like fleas when disturbed. They chew numerous small, round holes in the leaves, creating a 'shot-hole' appearance which can weaken the plant, especially young seedlings.

Steps:

    • In late spring or early summer, after the plant has finished flowering, select a healthy, non-flowering stem.
    • Using a clean, sharp knife or pruners, take a 3-4 inch (8-10 cm) cutting from the tip of the stem.
    • Carefully remove the leaves from the lower half of the cutting.
    • Dip the cut end into rooting hormone powder to encourage faster root development, though this is optional.
    • Insert the cutting into a pot filled with a well-draining potting mix, such as a mix of perlite and compost.
    • Water the medium, cover the pot with a plastic bag to maintain humidity, and place it in a location with bright, indirect light.
    • Keep the soil lightly moist. Roots should develop within 4-6 weeks.

Neem Oil

A natural, broad-spectrum insecticide and fungicide used to control pests like aphids and spider mites.

Horticultural Grit

An essential soil amendment to improve drainage for Candytuft, preventing root rot in heavier soils.

Rooting Hormone Powder

Used to stimulate root growth and increase the success rate when propagating the plant from cuttings.

Diatomaceous Earth

A natural, non-toxic powder that can be dusted on plants to control soft-bodied insects like flea beetles and aphids through physical abrasion.