They plant cloves into trenches and as the leaves grow, fill in the trenches — eventually hilling up around the stems. This excludes light, making the stems a pale greeny yellow, the flavour more subtle and the stems more tender when eaten. Garlic greens are grown in exactly the same way, but instead of pulling the whole plant from the soil, the leaves are cut about 2cm above the clove.
This leaves the clove to continue growing and a few weeks later another cut can be made. Generally two or three cuts are made before the clove is exhausted. Garlic greens look very similar to the leaves of garlic chives Allium tuberosum but its flavour is more subtle.
Garlic sprouts and garlic greens are often grown in tropical regions where it is not possible to grow a mature garlic bulb. So these forms of garlic are commonly seen in recipes from tropical parts of Asia.
Department of Agriculture plant hardiness zones 4 through 9, and it's usually grown as an annual plant. Fall planting provides the largest garlic bulbs, but you can also plant sprouting garlic in spring.
Garlic grows best when it receives a period of chilling at temperatures below 65 degrees Fahrenheit. Cloves planted in spring sometimes don't form bulbs. In USDA zones 4 through 9, plant sprouting garlic in fall after the first frost but before the ground freezes. If the area rarely experiences frosts, plant garlic when deciduous trees are bare. In colder zones, plant garlic in spring as soon as the ground thaws.
You can also try planting garlic in fall in colder zones. Cover the planting site with a 6-inch layer of straw, spread burlap over the straw and weigh the burlap down with stones. With this protection, the cloves may survive over winter.
Garlic grows best in well-drained, medium-moisture soils rich in organic matter, and full-sun sites. Loosening the soil helps improve drainage. Garlic is a perennial that is typically grown as an annual and planted in midautumn or spring. Softneck garlic is recommended for warmer areas of USDA zone 8. If you plant garlic in the fall, you get bigger and more flavorful bulbs when you harvest them in the next summer. Plant cloves, sprouted or not, six to eight weeks before the first expected hard frost in your area.
If you plant them in autumn, cover them with a 4- to 6-inch layer of grass clippings, chopped leaves or straw to prevent them from being pushed out of frozen soil. Plant cloves in the spring as soon as you can work the soil. Break the cloves from the bulb for planting but keep the papery covering on the cloves.
Take special care with presprouted cloves, which will have already broken through this protective papery layer.
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