Seeking advice from knowledgeable gardeners out there. This spring we purchased a couple flats of pepper plants from a local garden store, then potted them up in containers (because the soil under the lawn is a typical suburban clay-gravel mix under the decorative inch of topsoil).
But there was a glitch. This year we bought some new pots and didn't notice that the new ones lacked drainage holes in the bottom. After an initial watering and a week of recurrent rain, the seedlings in those pots were swimming in a soil/water soup that couldn't be poured out without losing the seedlings. So we moved those pots under the screen porch where they wouldn't receive any more rain.
Somewhat surprisingly, most of the plants survived, and have wound up looking quite different. The top photo shows the ones in full sun in the back yard (mulched with marsh hay). The peppers are forming nicely and on schedule, but the leaves look rather pale green.
Here are the pots that have been sitting under the screen porch for the past couple months:
Some died off (drowned, apparently), but these others are maturing and seem to be a week or two "behind schedule" in flowering and fruiting. But the curious feature is how much more deeply green their leaves are. (The photos may be slightly distorted because of the difference in ambient light, but the difference is real).
Why so different? I don't know. It seems statistically unlikely that the ones in the pots are from different flats/different strains of peppers. My instinct tells me that pale leaves represent nutritional deficiency of some type, but those out in the yard were planted in Miracle-Gro potting mix, which should have a superabundance of minerals for these modest-sized plants. Does repeated rain and watering wash out those additives from the potting mix when used outdoors?
Or are the under-deck dark-leaved plants intensifying their chlorophyll production because they are situated where they receive only indirect light?
Some reader out there may know. I'm just an English major blundering through the practicalities of life.