Been using water crystals for years for outdoor growing. They work great. You will get more growth. They not only increase available water with the rains but they also tend to keep the soil looser and more airated by expanding and contracting. You can use up to about 1.3 times the recomeded rate with no trouble. Turn them into about 5-6 inches. Don't overdo it though, as there is a definite best / max rate. Over that and you will end up with a big jelly like mess after a rain.

good luck

BTW - any cheap brand will do its all the same stuff. Can get it at any garden center.
unclebob Reviewed by unclebob on . water considering an outdoor geurilla grow; i'm in boulder, CO. finding a suitable location is going to be difficult, but i'm willing to try. i'm not going to put a lot of time into it, and i won't be visiting often. there is lots of open space around here, but lots of hikers too. still i have some ideas off the beaten path, probably up on the hillsides. anyway, my main question is WATER. we don't get much rain. can i plant on a hillside and the plants will grow without me watering them? in the Rating: 5