The grass needs more nutrients to develop seeds than it does to grow runners, so trying to get your grass to self-seed can instead pull nutrients from the soil and weaken existing grass. Look for germination in about 10 – 30 days. Lemongrass is hardy in USDA Zones 10 to 12 and can be grown anytime. When choosing lemongrass in the store, look for firm, not rubbery stalks, that transition from pale yellow at the base to bright green in the husks. By late summer, lemon grass plants growing under ideal conditions (good soil, full sun, adequate water) can reach 5-6′ tall x 5′ wide. In the garden, lemongrass forms a tall, grassy clump 3 to 5 feet tall. Its distinctive seed heads look like a bottlebrush, making this species popular as an ornamental grass. Lemongrass is a tropical herb packed with strong citrus flavor. However, seeds saved over multiple generations from the same region do tend to develop qualities that are uniquely suited to their growing zone. Remove the plastic wrap once the lemongrass seeds grow up to 1 inch in height. Lemongrass (Cymbopogon citratus) is a commonly grown herb.Both its stalk and foliage are used in many prepared dishes such as teas, soups and sauces. How big are lemongrass plants at maturity and what do they look like? Lemongrass is a tropical grass that thrives in summer heat. A versatile herb that can be used in all kinds of recipes, from marinades to curries and cocktails to stir-fries, lemongrass has a deep citrusy aroma that can typically be found in Thai cooking and other Asian cuisines. This grass is a cool-season perennial grass and ripens to a straw color in the summer. To get the most flavor out of lemon grass, use a knife or cleaver to bruise the bulb and then mince the pieces. In the wild, it is found growing in wooded and shaded areas, but can also be grown in full sun if need be. If you want to use lemon grass while cooking, try pairing chopped lemon grass with other spices, like chilies, cilantro, and garlic, for exotic tastes. Tips for Growing Lemongrass from seeds. It can be grown as a perennial in our climate, but care must be taken to control moisture in the soil over winter, and to provide protection from frost. It is well suited to container growing, and ideal for greenhouse cultivation. While it is easy to grow and care for, some people are not sure about when or how to go about picking lemongrass. The lemon taste is prized in Asian cooking, as well as in teas, sauces, and soups. If you’re planting lemongrass in close proximity, space them at least 5′ apart. Please allow lemongrass to (re)introduce itself. Lemongrass is a tropical plant, so it would be difficult to hybridize one that is truly winter hardy. 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