Canna Lily - Knowledgebase Question

Beaverton, OR
Question by jruthandrich
July 8, 2007
My friend gave me a large Canna Lily plant which she split out of her garden. I planted it in a semi-shaded flower bed but it is not doing well and has not flowered this year. Can you advise me what I need to do to make it thrive. Next year my son is getting married and they want to use lillies from my Canna....please help. Thank you.

Answer from NGA
July 8, 2007


Canna lilies grow best in full sun so I expect that your new plant is struggling in a semi-shaded garden spot. Here are some growing tips:
Choose rhizomes that are thick and firm and have at least one eye (growing point or crown).
Cannas won?t tolerate dry conditions, so water at least once a week. When cannas need water, their leaves begin to curl slightly.
Choose a site where they will have at least four hours of full sun each day. The more water, fertilizer and bright sunlight they get, the bigger they will grow.
Cannas do best in rich, moist soil with lots of added organic matter. Plant rhizomes 4-5" inches deep, laying them horizontally with eyes pointing up, then cover with soil.
Good air circulation is important, so space rhizomes 18-24" apart. Small or dwarf cultivars may be planted as close as 12" apart.
Feed every two weeks during active growth with all-purpose, water soluble (20-20-20) fertilizer or once a month with granular bulb fertilizer.
Deadhead to promote continuous flowering, being careful not to destroy developing buds.
Because they?re sturdy, there?s no need to support canna stems, but they may need protection in windy locations to prevent leaves from becoming tattered.
Cannas may be attacked by slugs or snails. The safest way to combat these pests is to pick them off by hand. Be extra diligent when the plant is young and more susceptible to these uninvited guests.

Take them in from the cold:
Overwintering should begin after the first autumn frost has blackened the foliage or the foliage begins to wither. Cut stems back to 4-5 inches. Gently dig up each clump of roots, turn them over and allow them to dry for a few hours. Don?t wash. Soil left on the rhizomes will help to keep them from drying out.

Store in barely moist, sterile sand, peat moss, or vermiculite in a cool, dark location. Ideally, place them on shelves or racks, or hang them in mesh bags so that air can circulate around the rhizomes. Don?t let the planting mix freeze or dry out during storage. The medium should remain moist but not wet, or the rhizomes will rot.

In spring, about six to eight weeks before the average date of the last frost in your area, remove the rhizomes from storage, split them into sections using a sharp knife, and make sure that each section has at least one good root and one good eye. Remove any damaged foliage and rotten plant pieces. Let the cut surface dry out for at least 24 hours before planting to prevent fungus. Plant each piece in a separate container of soil or planting mix until it?s well rooted. Begin a regular watering and monthly feeding program with a 10-10-10 fertilizer. When all risk of frost has passed, transplant the young plants into the garden. (They may be transplanted as late as June, but then will only produce foliage, not flowers.)

Hope this information is helpful!

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