Ok so this is a very basic and cheap way to keep your plants healthy and well fed. Things that you will need:
2 liter bottle
package of yeast
tubing (aquarium tubing works well)
sugar
water
nail (or another poking device)
hammer
sealant
First off you want to clean the bottle out and then start with making a hole in the top of the cap. I make two holes here for multiple plants. If you dont want to use two holes you can buy a splitter for the tubing at the hardware store. I wouldnt suggest using one bottle for more than two plants.
Next step would be to insert your tubing
now put about 2 cups of sugar into the bottle
and then the yeast
next fill the bottle about half full with water a little warmer than room temp.
and give this whole solution a good shake until its mixed up throughly.
now place your cap on the bottle with about 2 inches inside the bottle
the next step is optional. You can either cover the bottle or not but keep in mind that yeast works faster in the dark which means more CO2 but this also means more sugar consumption. So this is a personal choice as to how often you want to add more sugar and water. This one bottle should last you about two weeks. Oh and a stupidity check here. The plants do not need Co2 when the lights are off so you can theoretically close it to save Co2. However when you close it up it will still create Co2 which given enough pressure will cause the bottle to explode. So please dont be cheap and blow your stuff up just go spend the 3 bucks to keep the yeast going
Place the tubes about 2 inches from your plant and watch the changes
Hope this helps you out. Have a great day and happy growing
