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Re: Purple Leaves on Tomatoes

It sounds to me like you have a phosphorus deficiency, but here is a
list you can refer to, out of Rodale's Organic Encyclopedia:

SYMPTOMS APPEAR FIRST ON OLDER OR LOWER LEAVES
nitrogen--lower leaves yellow, overall plant light green, growth stunted
phosphorus--foliage red, purple, or very dark green, growth stunted
potassium--tips and edges of leaves yellow, then brown, stems weak
magnesium--interveinal chlorisis, growth stunted
zinc--interveinal chlorosis, leaves thickened, growth stunted

SYMPTOMS APPEAR FIRST ON YOUNGER OR UPPER LEAVES
calcium--buds and young leaves die back at tips
iron--interveinal chlorosis, growth stunted
sulfur--young leaves light green overall, growth stunted
boron--young leaves pale green at base and twisted, buds die
coppor--young leaves pale and wilted with brown tips
manganese--interveinal chlorosis on young leaves with brown spots
scattered through leaf
molybdenum--interveinal chlorosis, growth stunted

I am normally opposed to using chemical fertilizers (like Peters, etc.),
but they do have very good all purpose mixes with minor nutrients (make
sure it says that on the label).  I think it would be easier to use that
once or twice that to try to figure out which specific nutrient is
missing and correct for that only.

Good luck!
Melissa in Gloucester MA (zone 6)

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