It looks like the chewers are back early?

[rweakley]

Originally Posted by feldon30

The purple bottom of that leaf really concerns me. But I don't know what issues you face in Maryland.

Can't really help with the diagnosis, but just wanted to throw out there that every seed I've planted has grown with the underside of the leaves purple just like his. And they turn out just fine. Nothing to be concerned about.

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[Crandrew]

Originally Posted by rweakley

Can't really help with the diagnosis, but just wanted to throw out there that every seed I've planted has grown with the underside of the leaves purple just like his. And they turn out just fine. Nothing to be concerned about.

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When I grew hydroponics the purple was due to a lack of certain nutrient(s). I do not recall.

[rweakley]

Guess I should caveat that with the leaves eventually turn green. Especially once potted up or planted outside.

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[dice]

Purple undersides of leaves usually means cold temperatures are
interfering with phosphorus uptake, but there are other potential
causes (diseases that mimic it by interfering with the same internal
process in the plant that induces the purpling when phosphorus
is deficient, other mineral deficiencies that induce a variety of color
changes, something in the seed-starting mix binding up all of the
phosphate and making it insoluble so that the plant cannot absorb it,
etc).

I tried fixing it once with a pipette (eyedropper) and some diluted
liquid phosphate, but the leaves dried up and the test seedlings croaked.
It is safer to just wait until the weather warms up and the seedling
simply outgrows the problem. (I had one do it this spring while it was
still inside the house, plenty warm enough. I had no clue what caused
it, but the seedling did outgrow it, even in colder temperatures in an
outdoor coldframe.)

[rweakley]

Originally Posted by dice

Purple undersides of leaves usually means cold temperatures are
interfering with phosphorus uptake, but there are other potential
causes (diseases that mimic it by interfering with the same internal
process in the plant that induces the purpling when phosphorus
is deficient, other mineral deficiencies that induce a variety of color
changes, something in the seed-starting mix binding up all of the
phosphate and making it insoluble so that the plant cannot absorb it,
etc).

I tried fixing it once with a pipette (eyedropper) and some diluted
liquid phosphate, but the leaves dried up and the test seedlings croaked.
It is safer to just wait until the weather warms up and the seedling
simply outgrows the problem. (I had one do it this spring while it was
still inside the house, plenty warm enough. I had no clue what caused
it, but the seedling did outgrow it, even in colder temperatures in an
outdoor coldframe.)

Exactly. They always outgrow it for me.

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