How Often Indoor Plant Food. Morning watering is preferable to evening watering as the plant has time to dry before the sun goes down. All you do is push the fertilizer pegs into the compost about an inch (1 cm.) from the pot’s side.
Plants need to befertilized once a week. Plants get the majority of the nutrients they need from the soil, but the soil has to get those nutrients from. Liquid fertilizers are diluted into water and applied with a watering can.