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Continue to water the plants regularly and fertilize them as needed. The plants will begin to grow tall, narrow stalks that reach high off of the ground. Keep in mind that it will take a few years for the plants to put on a lot of growth. The stalks will grow rows of bright green leaves that are about 2 inches (5.1cm) long. The plants will flower beginning in April or May and will continue to blossom through July or August. The yellow flowers are small and oval in shape. The flowers hold capsules that contain 15 to 20 cardamom seeds. Some plants may take up to 4-5 years until they bloom. Although the plants flower early in the year, wait to begin harvesting until October or November, so the cardamom can ripen. Once the capsules of cardamom fruit begin to dry out a little, pull one to see if it breaks easily. If the fruit snaps off easily, you can begin pulling off all of the ripe capsules. Cardamom plants will continue to produce more cardamom seeds every year. Depending on how many capsules you want to dry, you can use a variety of drying methods. For small-scale drying, spread the cardamom in a single layer and allow the sun to dry the capsules. Larger, commercial harvests often dry cardamom using extremely hot kilns. Once the cardamom is dry, you can open the capsules and crush the cardamom to cook or bake with.
Grow the plants until they're 6 to 10 feet (1.8 to 3.0m) high. Wait 2 to 3 years to harvest the cardamom fruits. Gather the cardamom capsules by hand. Dry the cardamom capsules.