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purple canna

Purple canna

Image: Credit: Mick49/Shutterstock
Submitted by Jakki on May 31, 2019 – 6:10pm
It’s worth noting that because some cannas have large soft leaves, it’s a good idea to position plants out of the wind so they’re not vulnerable to damage.
I have several shades of Cannas in my garden. Full size (in the back) and dwarf (on the front). I leave them in year round as we are close to Dallas, TX. They’ve been in the ground for 2 years since we bought the house. In 2 years I’ll dig them up and separate them. We have dogs so my first instinct is to use chemicals LAST. Worms and slugs love flowering plants. Worms will role themselves up in your leaves so look under the leaves. Cannas love water so slugs love cannas. I always hand pick off worms, slugs, insects/bugs first. Over the years I’ve talked to many folks (of course my mom first) about what is best to use.
This is what I do. Some folks will come back and say this or that doesn’t work. I don’t compost so I’m saying this is what I do. All my plants have mulch. I save egg shells and crush them up and scatter them around. I drink coffee daily so I scatter the used coffee grounds. If you don’t make coffee at home maybe you can get the used grounds from work. My hair dresser gives me cut hair and I scatter that as well.
As a bloom begins to die back I pull the dead parts straight up. The bloom and stalk will die all the way to brown. I cut the stalk down to where it is still green. I crush the dead part between my hands and drop it in the garden. Some gardners will cut the whole plant down but I don’t. I like the leaves so I just cut down to where it is still green. My canna will send up another stalk and pretty soon it will bloom.
If all that still does not help, before I go to the chemicals, I check my gardening books. If I have to I’ll cut a stalk and go to the nursery and ask for help in identifing the culpret. I’ve tried the organic sprays and they have just not helped. Good luck.
Submitted by Dan on August 11, 2019 – 12:54pm
Submitted by Sheila on July 7, 2019 – 12:11am
Submitted by Mary Ellen McClowry on April 28, 2020 – 11:50am

  • Cannas prefer at least 6 hours of sun per day
  • Provide adequate space to insure good air circulation
  • Avoid planting Cannas in shady or poorly drained locations
  • At the first sign of rust, prune the foliage and discard.
  • Prune plants periodically to reduce crowding and humidity within the canopy

My cannas are about 2 feet shorter this season. Does anyone know what would cause this to happen? Up until this year they have gotten taller with each season. I planted them about 4 years ago.
Canna Lilies: How to Plant, Grow, and Care for Canna Flowers from The Old Farmer's Almanac.