hisbiscus - Knowledgebase Question

Southport, Fl
Question by brettndebsne
October 12, 2009
my hibiscus leaves are turning yellow , does it need plant food or more water?

Answer from NGA
October 12, 2009


Yellow leaves can be caused by many things including lack of nitrogen, insufficient light, water-logged soil (plant roots need oxygen to thrive), dry soil, or iron deficiency. If the older bottom leaves are yellow, but new growth is green, it's usually a lack of nitrogen. If new leaves are yellow, with green veins, it's usually a lack of iron. Lack of nitrogen is a more common problem than lack of iron. It's important to water deeply, slowly and usually infrequently. At least once a month, water deeply enough to "leach" or push salts well below the root zone. Frequent, light "sprinklings" or short time spans with drip irrigation, allow salts to accumulate in the top layers of soil, where the roots are, which is bad news. Similar symptoms occur when too much fertilizer has been applied. It's generally not advisable to fertilize landscape plants in our summer heat. Hope this information helps you determine just what might be happening with your hibiscus.

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