In this precocious April its a good question John, and much of it can be removed now or soon because its on those vegetables you describe, which tolerate some cool conditions. I have used it to help them get going for about three weeks. Soon it will go on courgettes and squash but…. if the weather stays sunny, I may not need to use it for them.
Today for example some lettuce under fleece was wilting a bit, perhaps too hot this afternoon. so I took it off and watered them. I replaced it with netting in case of badger, rabbit.
