My tomatillo plants are huge and producing flowers and husks, but the fruit is not developing. I opened a few today that fell off and it looks if the are just a small glob of mold. It has been hot here (MS delta region) and humid the last few days but aren't they from Mexico? What can I do, if anything, to save my crop?
It has been a hard summer on nightshade vegetables, with the high heat and humidity. The high humidity makes it difficult for them to pollinate well. You may need to hand pollinate. Tomatoes and tomatilloes are pollinated in the same way, so this article will help: https://www.gardeningknowhow.com/edible/vegetables/tomato/pollinate-tomatoes.htm