Citron Daylily

Water regularly during the growing season, providing 1 inch of water per week to keep the soil consistently moist but not waterlogged. Reduce watering frequency after flowering ceases, allowing the top 2 inches of soil to dry out between waterings in fall and winter.

Thrives in full sun, requiring a minimum of 6 hours of direct sunlight daily to produce abundant blooms. It can tolerate partial shade, but flowering will be reduced, and plants may become leggy if grown in overly shaded conditions.

Adaptable to a wide range of soil types, but performs best in fertile, well-drained loam with a slightly acidic to neutral pH of 6.0 to 7.0. Avoid heavy, waterlogged clay soils, as these can cause root rot and other fungal issues.

Apply a balanced, slow-release 10-10-10 fertilizer in early spring as new growth emerges to support foliage development and flower production. A light topdressing of compost in mid-summer can provide extra nutrients, but avoid over-fertilizing, which leads to excessive foliage growth at the expense of blooms.

Prefers temperate climates, with ideal growing temperatures between 60 and 85°F (15 to 29°C). It is cold hardy to USDA zone 3, surviving winter temperatures as low as -40°F (-40°C) when dormant, and tolerates short periods of summer heat up to 100°F (38°C) with adequate water.

Remove spent flower stalks at the base after blooming is complete to encourage a tidy appearance and prevent self-seeding if desired. Cut back yellowed, dead foliage to ground level in late fall or early spring before new growth emerges to reduce overwintering pest and disease habitat.

Most commonly propagated by dividing mature clumps every 3 to 5 years in early spring or late fall, when plants are dormant. Division involves digging up the entire clump, separating the root mass into smaller sections with at least 2 to 3 growth buds each, and replanting immediately at the same depth as the original plant.

Tolerates average ambient humidity levels between 40 and 60%, which is typical of most temperate growing regions. It does not require extra humidity, and high humidity combined with poor air circulation can increase the risk of foliar fungal diseases.

For container-grown specimens, repot every 2 to 3 years in early spring, moving to a pot 1 to 2 inches larger than the current container to accommodate expanding root growth. Ensure pots have adequate drainage holes, and refresh the potting mix with a loamy, well-drained blend at repotting time to replenish nutrients.