A kumquat is a citrus fruit that is not normally grown from seed. Commercial growers graft seedlings onto the rootstock of a stronger citrus tree to produce the fruit. However, many home growers have successfully planted the seeds and grown kumquat trees. For best results, take the seed directly from the fruit.
Prepare the container with soil before taking the seed from the kumquat. Mix 1 part potting soil with 1 part compost and fill the container to within 1 inch of the top.
Cut open the kumquat to expose the seeds. Remove the seeds and rinse them with warm water. Place the seeds 1/2 inch deep in the soil immediately after rinsing. Don't allow the seeds to dry out.
Water until the soil is moist, then cover the container with plastic wrap. Place the container in a warm location where it will receive bright light. The seeds should germinate in three to four weeks. The soil should stay moist under the plastic, but if it starts to dry out, apply more water.
Once the seeds germinate, place four Popsicle sticks around the outside of the container to hold the plastic wrap higher. Place the plastic wrap over the sticks and extend it down to the container. Leave the plastic covering on until the plants are 3 inches tall.
Keep the plants in a cool, sunny location. Transplant them to a larger container each year until you have reached a 12-inch pot. If you live in a warm climate, you can transplant the tree into your landscape.