Potting and Fertilizing. A lemon tree requires a substantial amount of root space, and at minimum will need a 1. Ideally, your tree would have a pot thats at least 2. Topping the soil with an inch of well made compost several times per year is enough additional fertility to keep your tree healthy and productive. Yields. Under ideal conditions, a small 3 foot tall well pruned lemon tree will produce as many as 2. While a lemon tree does not require a second tree for pollination, they tend to produce more fruit if theres more than one tree available to help set fruit. While flowers tend to set fruit readily, if youre seeing flowers but no fruit, try manual pollination by sticking a cotton swab or small paint brush into each of the flowers. Have you ever grown lemon trees indoors What advice would you add Share your tips in the section below.