Do you put compost on top or underneath mulch. Advertentie Bekijk ons uitgebreide aanbod Compost online. Shady Garden Location Victoria British Columbia Canada Designer Jonathan Craggs Garden Design Also Based In Victo Shade Garden Side Garden Japanese Garden In general you can use plastic storage boxes from 10 to 18 gallons to have a good amount of compost for your indoor garden. How to use compost for indoor plants . Apart from being part of the potting mixture most potted plants should be given an extra dose of vermicompost during their various growth stages. If you have seedlings that are just starting to sprout it may be too early to give them compost but for every other plant you should be okay. Refresh the compost in pots every year or so to replace nutrients. Provide heavy feeder plants such as tomatoes corn and squash with 12 inch of compost monthlythis will result in great produce. According to the RHS for most plants A multipurpose compost houseplant compost or