they should be fine in the rain, if anything you should be doing your rain dance. I am using the same ferts as you, the alaskan fish fertalizer and the Alaskan Morebloom. They are great products you can use the fish fert on your plants now, they are old enough, but use a half tbsp instead of a full one! Also animals will dig up your plants if they are not in the tree's yet! So dont fert till your plants are safe from critters..The Morebloom is good too, im already using it on some of my grapevines, they love it!