Review on 12-Pack OZMI Plant Self-Watering Spikes With Slow Release Control Valve - Automatic Irrigation Equipment For Home And Vacation Plant Watering, Adjustable Drip System For Optimal Water Volume by Jesus Cordova

I loved the idea behind these as I have a small garden and need a way to keep it watered when I am out of town for a day or two. You can pretty much stick any bottle In these. However my gallon bottle was so heavy it pushed the entire spike into the soil and clogged the drip. Other times the bottle tipped over somehow and just emptied its contents entirely. The drip system requires lots of trial and error to find the proper drip speed, the first time I tried I came back to a completely emptied gallon bottle after only a few hours. These would work well for single potted plants however I would not recommend for a garden with multiple plants. I do not regret buying but not quite as helpful as I hoped!