Moderate Water Needs Kohlrabi requires a moderate amount of water. You will want to allow the top few inches of soil dry in between waterings. As a general rule of thumb, depending on where you have planted and how much light your Kohlrabi receives, you may need to water once a week.
Growing Indoors If you are growing indoors or in a container, you can always check the moisture of the soil by using your thum or finger. Stick it in the soil -- if it is dry, then you will likely want to water your Kohlrabi.
Pot selection is also important to keep your Kohlrabi from getting too wet. It is important to select a pot with plenty of drainage holes as this will allow excess water to train out of the pot rather than to just sit on the bottom. Drainage holes also allow air to get into the soil from the bottom of the pot. Using a terracotta pot or another type of pot made of a permeable material can also help keepKohlrabi from getting too wet. Terracotta and other similar materials allow water to wick away from the soil faster than they would in a plastic pot.
Growing Outdoors If you are growing Kohlrabi outdoors, the amount of light your plant is receiving is key to determining how often to water your plant. Plants that require moderate water, generally do best if they can get some respite from the sun during the day as it can dry out the soil fairly quickly. If you have planted in a sunny area, you will likely need to water this plant more often than if it is planted in a shady area. The type of soil you plant in is also important. Sandy and loamy soils tend to dry out much quicker. You can always amend soil with organic material such as peat moss or compost to encourage moisture retention.
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Bright Indirect Light or Partial Sun Kohlrabi can grow in bright indirect light which means it prefers at least 4-6 hours of diffused natural light (ideally 6 hours). Growing Outdoors When plants thrive in bright, indirect light only this means that you will want to avoid exposing them to direct sunlight unlessKohlrabi is also explicitly noted to tolerate direct sunlight.
If growing outdoors, you will want to plant Kohlrabi in an
area that receives morning sunlight that's not too harsh and
afternoon shade for most natural light. You can consider East
facing portions of your garden as those get more morning sun. Growing Indoors If growing indoors, you can place near an East-facing window that will receive morning sun for half of the day and afternoon shade. You can also consider placing a few feet away from a South-facing window for diffused light. However, be careful about placing in direct sunlight of a South-facing window as that can cause leaf gscorch and affect growth. You can always diffuse the harsh light of a South-facing window by using a sheer curtain.
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