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Kinds of Grass Seed. It is quite possible to make a lawn of one kind of grass. You will find that some people advocate lawns made exclusively of creeping bent, of Merion bluegrass and of other special types. When perfectly kept, such greenswards can be magnificent, but they need considerable upkeep and demand special knowledge on the part of their caretakers. In a one-grass lawn any other grass is a weed and must be eliminated (not always an easy task). Should a disease or insect to which the particular grass is especially susceptible gain a hold, you have real trouble on your hands. The whole lawn is likely to be affected quickly, perhaps with disastrous results. In a lawn composed of several kinds of grasses the less susceptible make a brave stand against the enemy and hold out; their weaker relatives succumb.
Except for very special purposes (making a putting green, for example) it is always better to sow a grass seed mixture than just one kind. In a way it is insurance. Different grasses, even different varieties of the same kind, prefer different soil conditions, and often these preferences are for minor variations not easy to recognize by simple soil tests. If you sow several kinds in mixture, those best adapted to your soil flourish; the others expire or become minor elements in the turf. It often happens that soil and other environmental conditions, such as shade and moisture, vary from place to place in the same lawn. By sowing
a mixture of grasses, you provide for the varying needs of these different situations.
There are other advantages. In most cases a mixture gives more uniform greenery throughout the season than a single type of grass, because of seasonal growth and temperature preferences. Bluegrasses thrive in the cool weather of spring and fall and go partially dormant during hot weather. Bent grasses generally make their best growth in hot weather. In dry weather fescues prosper better than other grasses. There are grasses more resistant to being walked upon than others. There are grasses valuable because they germinate and grow quickly, act as "nurses" to the slower-to-get-going kinds and then gradually die out. In the meantime they prevent erosion and help to keep weeds out. Almost surely a mixture of grass seeds is your best bet when making a new lawn.