SODIAL(R) 4 x Garden Watering Spikes Plant Waterers for Holiday Bottle Irrigation System This device puts your old plastic bottles to good use and features a patented, easy to use flow control to make sure your plants are watered just the right amount, at all times. Simply screw a spike onto a full bottle of water, then insert the pointed end directly into the soil near a potted plant's stalk. No need to worry about watering your plants while you're away on a short break, this clever device simply attaches to any screw-top bottle and does the watering for you. Color: Blue & Green. Length: 13.5 cm