Usually, if you plant is yellowing throughout, I would go with high nitrogen like 20-10-10 or 10-5-5 to be safe. But if all looks well, 10-20-20 is the standard in fertilizers. You can pick up some cheap, yet decent, ferts at k-mart or walmart, or any home and garden stores like Home Depot. When buying higher nitrogen ferts to darken up ur leaves, check out some of the ferts labeled grass fertilizer. They are usually hi nitrogen and are inexpensive. A lot of people like to buy hi nitrogen ferts, but honestly, if your leaves are nice and green 10-20-20 is excellent. Been using it on my family farm for decades. Farming is our family business.
Maulrat Reviewed by Maulrat on . Fertilizer, Mini-guide I think a lot of people have questions about fertilizing, so here is a mini-guide that I have taken off the net that can probably help out. It only concerns N-P-K. Main uses of the plant: *Nitrogen promotes leaf growth. Use on hedges, grass, shade trees and other foliage plants. (10-5-5 or 20-10-10) *Phosphorus promotes flowering; use a low nitrogen-high phosphorus fertilizer. (5-10-10 or 10-20-20) Use on perennials and flowering shrubs. *Potassium promotes stronger stems and Rating: 5