hibiscus - Knowledgebase Question

phoenix, Ar
Question by kenkrueger
July 12, 2010
have a group of hibiscus that leaves have shriveled or dried up,have another group doing fine .both groups in full sun,watered regularly,added acid to soil.what can i do to help the first group


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Answer from NGA
July 12, 2010

0

Although the plants are the same and they are getting the same care, the soil may be slightly different with the distressed group. Our soil is clay and it holds water well but sometimes too well. Soggy soil can cause root rot and the beginnings of this stress can show up in wilting foliage. Check the soil drainage by pushing a metal rod (I use rebar) into the soil after watering. It will be easy to push the rod through moist soil but you'll meet some resistance if the soil is dry. The roots of your hibiscus can be 24" deep so make sure when you water the moisture penetrates that deeply. Then, before watering again, check to see if the soil is still moist 18-24" deep. If so, you don't need to water; if not, it's time to apply water - slowly so it has a chance to percolate down and wet the entire root mass. Aside from watering issues, reflected or radiated heat can stress the foliage. Hope this information is helpful.

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