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The fastest growing grass seeds are Bermuda grass, which is a warm-season grass and ryegrass, which is a cool-season grass. Both of these grass types tend to germinate in five to 10 days. Other fast-growing varieties include perennial Ryegrass and fescues, all of which have unique characteristics and growing requirements.

Many homeowners in warmer climates like this resilient, hearty grass because it can tolerate excessive heat and drought while developing into a lush lawn. Unlike other grasses, Bermuda grass grows and spreads quickly and can withstand excessive foot traffic. But whether Bermuda grass is good for lawns may depend on your geographic location, as this grass has a low tolerance for cooler temperatures, which causes it to go dormant and turn brown in the winter months.

Whether or not grass will fill in bare spots itself depends on the type of grass you have. For example, grass with rhizomes (e.g., Bermuda grass) and stolons (e.g., Saint Augustine grass) will naturally fill in bald spots as it spreads laterally. However, clump-forming grasses will not spread. 

Yes, Bahia grass spreads on its own thanks to its short stolon system. However, it might not seem like your Bahia grass spreads well due to its slow growth. Bahia grass takes around 3 to 4 weeks to germinate and an additional two weeks to grow thicker. 

During this time, fast-growing, competitive weeds may pop up, so weed your lawn to give your Bahia grass a chance to grow. This grass can take up to two years to become established. Once established, Bahia grass typically does well in suitable climates.