Flowers

How to Grow Lisianthus: Planting, Spacing, Care & Bloom

Quick answer

Start indoors 10 to 12 weeks before last frost (NC State). Some schedules use 14–16 weeks (Iowa State). Field transplant about 2 weeks before last frost (USU). WSU allows about 6 weeks before if frost-tolerant set-out

Lisianthus at a glance

PlantStart indoors: 12–10 wk before last frost; Transplant: 2 wk before last frost
SunAverage moist well-drained; full morning sun and afternoon shade; drought tolerant once established (NC).
SpacingSurface sow / fine cover — need light (USU).
Days to bloomAbout 5 months from planting to first bloom (NC State)
-13-12-11-10-9-8-7-6-5-4-3-2-1LF+1+2+3
■ Start indoors   ■ Plant out   ■ Harvest
Weeks relative to last frost (LF). Colored weeks show when our ZIP planner schedules each step.
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Updated

Lisianthus (Eustoma grandiflorum / E. russellianum) — tender perennial grown as an annual; excellent cut flower. Tiny seed — often purchased as transplants.

Lisianthus blooms
Lisianthus (Eustoma russellianum). Photo: SAplants, Wikimedia Commons, CC BY-SA 4.0 (resized).

Sourced from university extension guides. For dates where you live, use the ZIP planting planner.

Planting timing

NC State: start seeds indoors 10 to 12 weeks before last frost; about 5 months from planting to first bloom. (NC State Eustoma) Iowa State lists 14–16 weeks indoors before transplanting for some schedules. (ISU seed start) USU cut-flower: sow 12 to 18 weeks before transplanting; open-field transplant about 2 weeks before last frost; high-tunnel about 6 weeks before. (USU lisianthus) Footnote: WSU notes lisianthus can tolerate some frost and may be planted outside about 6 weeks before last frost. Planner primary: Start indoors last frost −12 to −10; Transplant last frost −2 (USU field).

Depth and spacing

Surface sow / fine cover — need light (USU). NC: height 1–3 ft; width 9–12 in. Follow plug tag for home spacing.

Sun, soil and water

Average moist well-drained; full morning sun and afternoon shade; drought tolerant once established (NC). USU: avoid transplant stress above about 85°F (rosetting risk).

Care

Pinch for branching (NC). Horizontal support/netting useful for cut stems (USU). Prefer plugs if greenhouse time is limited.

Bloom

About 5 months seed to first bloom (NC). Long vase life as a cut flower (USU).

Pests and diseases

NC: no serious insect problems; watch viruses and stem cankers; susceptible to fungal diseases. Cultural: air circulation, avoid prolonged leaf wetness, discard virus-suspect plants. Soft-bodied pests: soap/oil if needed as labeled.

Related: ZIP planner · organic pest control

Frequently asked questions

When do I start lisianthus indoors?

10–12 weeks before last frost (NC). Some schedules use 14–16 weeks (ISU).

When do I transplant?

Field about 2 weeks before last frost (USU). WSU allows about 6 weeks before if frost-tolerant.

Why buy plugs?

Tiny, slow seed — NC notes transplants are often purchased.

Sources