my mom used to put house plants in these. they are like a silicone gel in texture. its a growing medium.

the plants always did well and didnt need much water. i dont know how it would be for mmj.
filo6942 Reviewed by filo6942 on . watering crystal soil balls not sure if these are the water crystals that i have read about people using outside or not. i found them while browsing the net. you can find them here. they are on sale for $.99 with the coupon code found at the top of the page with free shipping. it's for 5 grams worth, which they say is over 70 crystals. Rating: 5