PLANT PROBLEM CHARTSYMPTOM PROBABLY PROBLEM/CURE
Larger leaves turning yellow - smaller leaves still green. Nitrogen deficiency - add nitrate of soda or organic fertilizer.
Older leaves will curl at edges, turn dark, possibly with a purple cast. Phosphorous deficiency - add commercial phosphate.
Mature leaves develop a yellowish cast to least venial areas. Magnesium deficiency - add commercial fertilizer with a magnesium content.
Mature leaves turn yellow and then become spotted with edge areas turning dark gray. Potassium deficiency - add muriate of potash.
Cracked stems, no healthy support tissue. Boron deficiency - add any plant food containing boron.
Small wrinkled leaves with yellowish vein systems. Zinc deficiency - add commercial plant food containing zinc.
Young leaves become deformed, possibly yellowing. Molybdenum deficiency -use any plant food with a bit of molybdenum in it.
