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Sprinkle water over the soil after you plant and then when it becomes dry.  Do not saturate the seeds with water, even if the soil is dry. The soil should only feel moist once you sprinkle the water. Using a watering can will help regulate how much water you pour onto the soil. You can use an all-purpose fertilizer. The exact instructions for fertilizing depends on the directions on the package of your fertilizer. Typically, you just need to apply the fertilizer around the base of the plant. You can purchase fertilizer at a nursery or at many home improvement stores. Ask an employee at your nursery for fertilizer recommendations if you aren’t sure about which brand to buy. Jicama vines grow quite tall, so they will need support as they grow. Stake the vines when they are about 24 inches (61 cm) in length. Place wooden tomato stakes about 4 inches (10.2 cm) deep into the soil next to the jicama vine. Loosely tie each plant with twine. Don’t forget to keep the soil moist as the jicama grows. Test the soil out by feeling it with your hand or gently digging into it with your fingers. Only water when the soil is dry since jicama does not do well with over-watering. Remove the tiny flowers that bloom on the jicama. Removing the flowers encourages stronger root growth. You can remove them with your hand, scissors, or pruners. Jicama is not likely to have pest problems during growth. This is because the flowers, seeds, and leaves are poisonous. If you do find that you have a pest problem, remove the pests yourself, or use an organic pest spray. Make sure you know what type of pests you are targeting when you go to buy pest spray.

Summary:
Lightly water the planted jicama seeds. Fertilize jicama once a month. Stake the vines of the jicama plant. Check the jicama plants daily for dry soil. Deadhead the blooms. Don’t worry too much about pests.