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Garlic plants will thrive just fine when grown close together and don't take up much room horizontally. Spacing plants about 3 1/2 - 4 inches apart is just dandy.
You can also start garlic in a glass of water, in a cool location, keeping the cloves lower half of submerged until roots sprout and then placing it in your hydroponic system. Don't leave it submerged for very long once the roots appear, or rot will usually follow.
Let there be light, and plenty of it, a bare minimum of 6 to 8 hours daily, but up to 10 or 12 hours is best. Do not leave the light on 24/7 - like all plants, garlic also requires the darkness.
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Garlic is very hardy once it is established temperatures as low as 30 degrees Fahrenheit for short intervals, and up to 85 degrees Fahrenheit are fine.
Garlic does well with a pH of at least 6.0 ,up to 6.5. As always, you should follow the guidelines of the nutrient line that you are using to ensure that your plants are receiving the proper quantities of macro and micronutrients.
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Pests and Disease
Garlic doesn't have many pest problems in the garden , it's actually a natural pest repellent. Diseases that plague garlic is generally limited to fungal, such as white Rot. Some pests that bother onions will also attack garlic but not as frequently, and the vampires will also be repelled.
In a conventional garden, garlic is harvested when more than half the leaves have turned yellow-brown, In a hydroponics garden the maturation is accelerated and you can actually see the cloves without digging them up - so judging when to harvest is simplified.
Hang the bulbs up to cure for up to six weeks in a shaded, dry, and well ventilated area. If you're going to plant more garlic you may want to save the biggest and best-formed bulbs to replant .