Lots of light. Keep your kumquat tree in a sunny window. If you’re planting outside, make sure it’s a full sun location protected from wind. If your area gets down to freezing temperatures, it’ll need to be covered with blankets and such. It might be a good idea to plant it in a container you can move and keep it inside in the winter months. Unless you live down south where it doesn’t get too cold.
Keep it watered. Kumquats like wet soil so water your tree about once a week and don’t let the soil dry out too much between watering.
Kumquat trees like sandy soil. Add some sand if your soil is too dense or clay-like. (We kept the soil that the tree came in from Williams Sonoma and it’s doing great.)
Prune any suckers that grow at the base of the trunk. These mini branches will never grow fruit and only take away nutrients from the rest of the tree.
Kumquats are the cutest little trees and great for a sunny, indoor spot. And they taste great! Sour, but great! Good luck!