Hostas do not reproduce true to type, so growing seedling hostas from a parent plant can result in blue, green, yellow or variegated leaves. Because of this, many hosta enthusiasts enjoy growing hostas from seed in order to obtain unusual or rare hostas--or just for the element of surprise.
Allow seed pods to form on hosta plants.
Collect seed pods by cutting the entire flower stem when the pods turn brown and begin to split open.
Dry the seed pod by placing the entire stem into a brown paper bag and suspending it in a cool, dry, dark room.
Break the pods open when the seeds are dry and plant them in sterile seed starter soil in clean seedling trays. Since only one in five seeds will germinate, plant the seeds close together.
Mist the trays with water and cover with a plastic cover. Store in a dark room that is between 60 and 70 degrees F. The seeds should germinate in 2 weeks time. Continue to mist to prevent drying.
Move the tray under fluorescent lights when they begin to sprout.
Wait until all chance of frost has passed and transplant your hosta sprouts directly into the garden soil in a shady to partly shady location.
Mulch the seedlings with a ¼ inch layer of sand to discourage mildew.
Water with a soaker hose. Never water from above the plant as this could cause the plant to mildew.
Fertilize the plants with a 10-10-10 fertilizer after the third leaf has emerged.