Citrus plants often suffer from yellow leaves. The same can be said of other acid loving plants. Yellowing leaves are usually related to low fertility, alkaline soils, or low levels of available iron.
Citrus food can address the fertility, Iron Sulfate or Soil Sulfur can improve the soil pH by steering alkaline soils toward acid, both make the existing iron in surrounding soil more available to the plant. Iron Sulfate also adds additional iron for quicker nutrient uptake.
Our citrus grower recommends a little bit of citrus fertilizer each month of the year. (Calculate the annual supply of fertilizer needed for your citrus tree by reading the fertilizer bag, then divide the whole quantity by 12 to determine your monthly dose).
We also recommend treating the soil with either Soil Sulfur or Iron Sulfate 3 times a year. Now is an ideal time because remaining rains will carry these products down into the soil. The impending spring growth will benefit immediately from this nutrient blast. Iron products such as Iron Sulfate help prevent yellow leaves on citrus, azaleas, and camellias and also keep a lawn greener with less mowing.
Products containing iron can stain paving. Take extra precautions to be sure you don’t stain your patio or driveway.
Plants take nutrients up from the soil most efficiently when soil pH is neutral or slightly acidic. pH Adjuster Plus gently acidifies the soil and allows nitrogen, iron and other essential nutrients and elements to be released for uptake by plant roots. Apply these granular products over the soil surface and let the rain water them in. The end result is a healthier, more beautiful plant with brighter, greener foliage.
pH Adjuster Plus is a pelletized soil sulfur that is much easier to apply than more conventional soil sulfur (no annoying dust).
Almost all plants will appreciate 2 to 3 applications per year but those plants that respond most dramatically to a pH adjustment include citrus, blueberries, camellias, azaleas and rhododendrons, gardenias and other plants that develop a seasonal yellowing of the leaf related to iron chlorosis. Most likely you can think of at least one plant you have around your home that suffers from leaf yellowing. Apply and then water or time your application to let winter rains do the watering for you.
Magnesium Sulfate has also shown to have a great greening effect. A little bit goes a long way and should only be applied twice a year; once in early spring and again in early fall.