Azalea Care in Tampa - Knowledgebase Question

Name: Garden Friend
Oldsmar, FL
Avatar for fboitalia1
Question by fboitalia1
April 27, 1998
We have quite a few azaleas in our yard, but few seem to be doing well. Our soil is not very acidic, so we feed the azaleas Miracid, and also mix in organic dirt, cow manure, etc. Someone even suggested coffee grinds for the soil once they have been used. Is this helpful? What can you suggest? The leaves are yellowish/brown on some of them, and they aren't flowering as much as they once did. Others have grown spindly and have more long thick twigs than leaves. They are on the east and north sides of the house (morning to midday sun to mostly shady on north side) What can I do?

Answer from NGA
April 27, 1998
Soil pH is a common ailment of azaleas as is poor quality water and lack of water. You mentioned the leaves were turning yellow. If it is the young leaves (those near the end of the shoots) turning yellow, I would suspect an iron deficiency. Treat with a chelated iron product.

If older leaves are yellowing, the cause may be the transition from winter to spring. Many of our evergreens in the south go through this transition as their older leaves yellow and begin to drop. There is no need to be concerned with this.

If the entire plant is yellowing, you may have a nagging root problem caused by seasonally drought or excessively wet soils, compacted soil and low organic matter content, and possibly root rots.

Often water quality can be a factor. High pH, high sodium, high salt content, and high chlorine can all stress plants resulting in symptoms such as you described.

Have your soil tested and if pH is a problem, begin making adjustments using powdered sulfur at the rate recommended on the test report. Continue feeding plants with an acidic fertilizer. Avoid manure as it is usually high in pH and often high in salt content. An acidic, organic alternative is cottonseed meal. Keep plants well mulched and water enough to avoid drought conditions.

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