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 Curtis Domus

I bought these to water my container vegetable garden when we were gone for almost 4 days. They are a nightmare to setup because they kept falling over and sinking too deeply into the soil. (I use a typical potting soil mix)I tried with several different size plastic and glass bottles ranging from 1 to 2 liters, and most failed to empty more than maybe 30% Luckily we got enough rain to keep my babies alive - but I wont be putting any faith in this product again.Save your money and spend a few bucks more on a drip system on a timer.