We use large quantities of white vinegar as a natural weedkiller, and, as a result, we end up with a lot of plastic gallon jugs.
Although they’re recyclable, I’d rather reuse them. I cut the bottoms out of the empty plastic jugs and place the tops over our broccoli and cabbage starts to protect the seedlings from our cold, early-spring storms here in the Pacific Northwest.
Even in our concrete raised beds, spring still has a slow beginning. I planted some starts without the homemade mini-greenhouses, for comparison, and the ones grown under jugs were bigger!