About this time in mid-July, slow release fertilizers and granular fertilizers that have been top-dressed are losing their effect and your plants may be looking yellow and lackluster. Lots of rain or heavy irrigation can also leach nutrients from the soil. Now is a good time to give your garden a fertilizer boost for full, lush growth and maximum flowering and fruiting
A good top-dressing of an organic fertilizer will last 4-6 weeks or a balanced slow-release fertilizer can last 8-12 weeks. We don’t recommend heavily fertilizing in late August because plants that are susceptible to root disease need to stop putting on soft leafy growth. Most citrus and gardenias, for example, have a root system that can be susceptible to root disease and it is important to “harden off” the growth before bringing them inside for the fall and winter.