How to care for Lisianthus

Buy healthy, green plants with no signs of wilting or disease. Plants should be stocky with plenty of leaves. It’ a plus if they don’t have any flowers on them so that their roots develop better before flowering.

Choose a site that has full sun to partial shade. Lisianthus likes moist, well-drained soil. It’s a good idea to work a shovel-full or two of compost into the soil at planting time.

Plant in spring, after your region’s last frost date when soil temperatures reach about 70deg. F. Lisianthus is tricky to start from seed, so look for seedlings at your local nursery.

Plant six inches apart and water well.

Keep soil evenly moist—but not soggy. (Mulch is a good idea.)

Clip faded flowers to promote longer bloom.

Fertilize every four to six weeks or work in a slow-release fertilizer at planting time.

Lisianthus will not survive even a light frost.

Lisianthus plants have strict growing requirements, which must be met for the plant to survive.

If you live in a region with cool winters you should plant Lisianthus plant in a container and bring it indoors for the winter. About the only locations Lisianthus will survive a winter are in parts of California and parts of Florida.

Dig a 6-inch hole in the yard and collect soil from the bottom for a soil pH test. Lisianthus plants must be grown in a soil pH range between 6.5 to 7.0 in order to avoid the plant developing micro-nutrient toxicities. Follow the directions on the soil testing kit and add lime to soil that is too acidic, or sulfur to alkaline soil.

Create a hole that is twice the size as the lisianthus plant’s root ball, and at the same depth as the plant has been planted in its container. Add a small handful of bone meal to the planting hole and work into the bottom. Place the plant inside of the hole and pack soil around its base.

Water the plant thoroughly and spread a 3-inch layer of mulch around the lisianthus plant. Keep 6 inches in between plants.

Fertilize every four to six weeks with an all-purpose fertilizer with a NPK amount of 10-10-10. Water the plant to moisten the soil after fertilizing. Provide enough water to your plant to keep the first 3 inches of top soil moist. Allow the top of the soil to dry out in between watering.

If you are moving your plant inside for the winter.

Cut back the plant after blooming with a pair of bypass shears. Dig a trench around the plant and lift it up from underneath. Place in a container full of potting medium and take inside until the spring.

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