Rosanne 1 Black Pearl, (F1) Lisianthus Seeds

Rosanne 1 Black Pearl (F1) Lisianthus Seed

Blackish-purple flowers deliver truly rare bouquet color
Thick petals and top flowering reduce transit damage
Excellent vase life showcases more usable buds
Rosanne stems create sophisticated premium arrangements

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Key Attributes

Botanical Name

Eustoma grandiflorum

Days to maturity

145 Days

Sun

Full Sun

Packet

15 Seeds

Zones 8–10 Check your growing zone

About Rosanne 1 Black Pearl, (F1) Lisianthus Seed, Lisianthus Seed

Black Pearl Rosanne 1 has very unique blackish-purple color patterns. Lisianthus is a wonderful cut-flower that has excellent vase life with more usable buds. The thick flower petals and top flowering habit of this series reduce botrytis problems during transportation if being used for commercial purposes.

Growing details

Planting

Sow Depth

Top of Soil

Days to Germination

10–15 days

Germination Type

D - Surface Sow

In-row plant spacing

6-9"

Plant profile

Life Cycle

Tender Perennial

Hardiness Zone

Zones 8-10

Plant Height

36 inches

Growth Habits

Upright

Seed & variety

Seeds Per Ounce

19,800

Color

Black

Seed Type

Hybrid

Before Planting

Lisianthus benefits from a full-sun site with fertile, well-drained soil and good air circulation. Incorporate compost without creating an overly rich bed, and keep soil pH near neutral based on a soil test. Because seedlings develop slowly, start with clean plug mix well in advance and avoid burying the tiny, light-requiring seed.

Planting

Start lisianthus indoors 12–16 weeks before the last frost, surface-sowing the tiny seed under light. Space transplants 4–8 inches apart. Keep the medium near 70–75°F, evenly moist, and brightly lit; harden seedlings gradually before transplanting.

Watering

Lisianthus flowers best with steady root-zone moisture. Irrigate deeply during dry periods, allowing slight surface drying between waterings and keeping water off leaves whenever practical.

Fertilizer

Lisianthus needs only moderate feeding. Use diluted balanced fertilizer during active growth, following label rates and limiting nitrogen so plants remain compact and flower freely.

Harvesting

Harvest lisianthus as buds begin opening or when blooms reach full color, depending on intended use. Cut above a branching point, place stems in water promptly, and remove spent flowers regularly.

Tips

Support lisianthus early in windy sites and avoid waiting until stems fall. Cut or deadhead above a branching point to encourage additional bloom, leaving healthy foliage intact.

Pests & Diseases

Fusarium crown and stem rot, Botrytis, Pythium root rot, and viruses threaten lisianthus. Fusarium often browns the stem base and causes one-sided wilt. Use clean plugs and trays, avoid planting too deeply, disinfect cutting tools, and discard persistently wilted or distorted plants rather than taking cuttings.

Monitor lisianthus for aphids, thrips, mites, beetles, slugs, and chewing caterpillars. Remove badly infested growth, use physical controls first, and apply labeled treatments outside pollinator-active hours.