|Part of the tomato plot at the Derwood demo garden, with underplanted lettuce|
|Pepper looking sad with the quick transition to sunshine|
|Tomato with similar symptoms at the demo garden|
You may also see some uncharacteristic purple coloration on older leaves on some of the plants that were transplanted while it was cold:
This is usually due to phosphorus deficiency. It doesn't necessarily mean you have to add phosphorus to your soil, because plants have a harder time taking up that nutrient in cool soil. If the newer leaves don't show the odd coloration, all is probably well, though of course you should get your soil tested every few years just to be sure. (Some plants are naturally purple, too, even some peppers, so make sure you know the variety.)
Speaking of purple and green and for no other reason, here is a photo of Spring Blush Tendril peas from the demo garden:
Gorgeous flower color (really more pink than purple) and great tendrils that are harvested for cooking in stir-fries and so forth. They will have pods soon - glad they made it through the hot spell without fading, since they were slow to get going in the early spring.