Q.Repotting A Canna…outdoor..white Stuff In Dirt…probably Mildew? What Should Be Done?
Had a freeze…some leaves brown, but roots seem fine.
Certified GKH Gardening Expert
Unfortunately, your photos did not come through. I am unable to say, for certain, what it is. There are a few causes, though.
Fungi and salt buildup would the first thing suspected. Many fungi develop a relationship with plant roots, and are beneficial. If growth seems normal, and it isn't stressed outside of the weather, then this is not likely a cause for concern.
If this is salt buildup, then flushing with quite a bit of water can help. To remove salt buildup from potted plant soil, rinse the plant's roots thoroughly under running water. Next, create a salt removal solution by mixing equal parts water and distilled white vinegar. Soak the roots in the solution for 15-20 minutes to dissolve any salt crystals. After soaking, rinse the roots again to remove any remaining salt. Finally, repot the plant in fresh well-draining soil and maintain proper care to prevent future salt buildup.
This search page will take you to several articles on the care of your Cannas.
