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Q.Cannas Leaves Have Big Brown Spots Covering Leaves.

Zone Dallas,tx | Anonymous added on July 18, 2022 | Answered

My mom recently gave me a portion of her established cannas that has been growing for over 10 years and has flowers about 7ft tall. I planted the bulbs with leaves that are about 1-2ft tall. I finally got one bloom that lived for a day but now all of the surrounding leaves are turning brown and dying. There was a new shoot that was growing (so exciting) but it only grew about 4 inches out of the ground and then turned brown and snapped at the base and died. I’m not sure if it’s the soil or the fertilizer I added to try to get them to grow. The fertilizer is for “roses and blooming plants”. I live in Texas and try to water all of my plants every other day. They get full sun where they are located. What might be causing this? Should I cut these leaves off? Also, notice the base of the stems are black?

A.Answers to this queston: Add Answer
GKH_Susan
Certified GKH Gardening Expert
Answered on July 28, 2022

It may be getting too much water or the soil is not well drained. Though they appreciate moist soil, it needs to be well draining. The roots could be saturated and unable to send nutrients up to the leaves and stems. It also could be fertilizer burn. Cut off the affected leaves. Make sure the rhizomes were planted properly and in full sun. Here are some articles that should help:

https://www.gardeningknowhow.com/ornamental/bulbs/canna/canna-lily-care.htm
https://www.gardeningknowhow.com/ornamental/bulbs/canna/canna-lily-fertilization-tips.htm
https://plants.ces.ncsu.edu/plants/canna/
https://plantpathology.ca.uky.edu/files/ppfs-or-h-01.pdf

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