Grow Lisianthus from Seed

Latin:  Eustoma grandiflorum

Growing lisianthus from seed can be a very rewarding but challenging process due to the plant's specific germination and growing requirements. By following these detailed growing instructions and the fresh seeds that we sell you will enjoy their beautiful flowers. They grow well in UK conditions.

Where to grow lisianthus

Lisianthus are a great cut flower and ideal for a herbaceous border. They like a bright spot which has been enriched with well-rotted compost.

How to sow lisianthus seed

The seeds we sell are high quality pelleted seed. The optimum time to sow the seeds is from January to April. Sow the seeds in quality seed compost. Space the seeds out on the surface of the compost and then gently press them in. Ideally cover them with a thin layer of vermiculite. Do not cover the seeds as they need light to germinate.

What are the germination conditions for lisianthus seed?

Place the seeds in a heated propagator at 21–24C or in a warm spot in the house. With pelleted seeds it is important they do not dry out, so it is best to cover the seeds with a mini greenhouse or clear plastic bag.  After planting, spray the compost to make sure it is wet but not waterlogged.

How long do lisianthus seeds take to germinate?

Germination is expected to take between 8 - 14 days depending on the temperature. When they have germinated remove the cover to allow the air to flow and avoid damping off. 

When do i pot up the lisianthus seedlings?

Allow the seedlings to develop their first set of true leaves and transplant them into individual pots. It is important to avoid the plants overcrowding and slow the growth down. Grow them on until they are ready to plant out. Continue to provide good light. They will benefit from a diluted fertilizer to keep them growing steadily. 

Hardening off my lisianthus plants

It is important to harden off your plants before planting them out. Move the plants from the greenhouse or windowsill initially to a sheltered spot outside. Keep an eye on the weather and if it gets cold then make sure you protect them at night. Allow a couple of weeks to fully harden off your plants.  

When do I plant out my lisianthus plants

When all risk of frost has passed plant your plant in a sunny well drained spot which has benefited from some extra compost or manure. Space the plants out 15–30cm apart (check the requirements of individual varieties).

How do I care for my lisianthus plants?

Keep the area clear of weeds and water the plants well. Keep a check for slugs which will soon destroy all your hard work. The plants will reward you with  beautiful flowers from late spring through the summer. Many of the varieties available make great cut flowers.  

Best Selling Variety

Lisianthus Sapphire mix is a delightful dwarf version that will make a great addition to your borders and pots.