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To use the Problem-Solver, simply start at #1 below. When you think you've found the problem, read
the Nutrients section to learn more about it. Diagnose carefully before making major changes.
If the problem affects only the bottom or middle of the plant go to #2. b) If it affects only the top
of the plant or the growing tips, skip to #10. If the problem seems to affect the entire plant equally,
Leaves are a uniform yellow or light green; leaves die & drop; growth is slow. Leaf margins are
Margins of the leaves are turned up, and the tips may be twisted. Leaves are yellowing (and may
turn brown), but the veins remain somewhat green. >> Magnesium (Mg) deficiency. b) If not, go to
Leaves are browning or yellowing. Yellow, brown, or necrotic (dead) patches, especially around
the edges of the leaf, which may be curled. Plant may be too tall. >> Potassium (K) deficiency. b) If
Leaves are dark green or red/purple. Stems and petioles may have purple & red on them. Leaves
may turn yellow or curl under. Leaf may drop easily. Growth may be slow and leaves may be small.
Tips of leaves are yellow, brown, or dead. Plant otherwise looks healthy & green. Stems may be
soft >> Over-fertilization (especially N), over-watering, damaged roots, or insufficient soil aeration
(use more sand or perlite. Occasionally due to not enough N, P, or K. b) If not, go to #7.
Leaves are curled under like a ram's horn, and are dark green, gray, brown, or gold. >> Over-
The plant is wilted, even though the soil is moist. >> Over-fertilization, soggy soil, damaged roots,
Plants won't flower, even though they get 12 hours of darkness for over 2 weeks. >> The night
period is not completely dark. Too much nitrogen. Too much pruning or cloning. b) If not, go to