For a screw-on metal cap, use a hammer and nail to punch a hole through the center. If you find that the bottle is draining too quickly, you can add a cap or cork.
A cap or cork is not always necessary, especially if the plant has been thoroughly watered beforehand. If you have a glass bottle, either a small glass soda bottle or even a wine bottle, you can fill it with water and bury the neck of the bottle toward the root of your house plant. Screw on the cap and place cap-first into the soil of your houseplant. Then, fill the bottle with water (you can add fertilizer or other nutrients, too). You can also poke a hole or two in the neck of the bottle if you wish for faster water drainage. You may need to use an oven mitt to hold the nail as it will get hot! Once the nail is hot, poke a hole in the center of the plastic bottle cap. Light a candle and carefully hold the nail in the flame to heat it up. For houseplants, I don’t recommend a two-liter bottle, however, you may find use for that larger size in your garden. You can convert 16-20oz plastic bottles, or even one-liter plastic bottles into self-watering plant bulbs with a candle and a nail. I also recommend getting the self-watering bulb deep enough and close to the root ball of each plant. Otherwise, the bottle will drain quickly and you’ll need to refill it. In all methods, you’ll want to start with watering the plant and saturating the soil fully before inserting your self-watering plant bulb. But with some recycled bottles and a couple of household items, you can make your own for free! Here are some variations using recycled plastic and glass bottles. You can buy self-watering plant bulbs online or at your home and garden store. I love using recycled materials both in my indoor and outdoor gardens.
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