Growing Lilium (Lily): Spectacular Trumpet Flowers for Borders & Cutting

About Lilies

Trumpet-shaped flowers on strong stems from scaly bulbs. Heights 2–6 ft. Elegant in borders; shorter types in pots. Species types naturalize well. Indispensable for cutting—remove stamens to avoid pollen stains. Shelter from wind; stake tall types.

Light & Water

Most prefer full sun but flower in partial shade (helps color retention). Some species need afternoon shade in hottest climates. Regular watering, especially in summer drought.

Soil, pH & Fertilizer

Well-drained soil critical (winter wet kills). Light, loamy, pH ~6.0 ideal. Some form stem roots; appreciate organic side-dressing. Summer mulch keeps roots cool. Plant bulbs 3x bulb height deep (except L. candidum: 1″ soil). Feed early spring and as flowers open. If soil test shows low potassium, supplement with muriate of potash or high-K fertilizer.

Pests & Diseases

Lily leaf beetle (Northeast): scarlet adult, larvae like orange/brown/greenish slugs with black heads. March–June: check leaf undersides for orange eggs, destroy. Handpick or Neem for young larvae; spinosad for adults (avoid when bees active). Aphids may transmit mosaic virus (yellow streaking/mottling). Rinse with forceful water.

Companions

Shallow-rooted plants keep roots cool. Lovely rising from ferns; bloom with roses, peonies, clematis.

Reflowering

Remove faded flowers to prevent seedpods (energy to bulb). After bloom, cut stem below blooms to leave foliage. Cut house flowers with short stems.

Dividing/Transplanting

Late fall dormancy best. Handle fleshy bulbs carefully; replant same depth in well-drained friable soil. Offsets at 3x height.

End-of-Season

After foliage dies, cut stems at ground or leave few inches as markers. Remove old foliage.

Calendar of Care

Early Spring

Light balanced fertilizer or compost side-dress. Check potassium if weak. Water if dry.

Mid-Spring

Northeast: watch for lily leaf beetle (eggs, larvae, adults). Treat with Neem/spinosad. Aphids: rinse or insecticidal soap. Mulch as soil warms.

Late Spring

Stake tall forms.

Summer

Water during dry spells. Deadhead; cut stem below last bloom after flowering.

Fall

Cut foliage, remove. Divide/transplant after dieback.