Answer: I think the best approach to having a green lawn most of the year is to plant a mixture of Kentucky bluegrass and perennial ryegrass. Kentucky bluegrass produces a dense turf with dark green, medium-textured leaves; it spreads by rhizomes. Kentucky bluegrass grows best in fall, winter, and spring when temperatures are cool; during summer its growth slows. RYEGRASS (Lolium spp.). Perennial ryegrass is well adapted to sunny or partially shady conditions. It grows best during periods of cool temperatures and is very competitive, rapidly establishing a uniform green cover. Fall seeding is preferred. It is extremely vigorous in its growth, particularly in the seedling stage, thus minimizing weed invasion.
As you can see, this mixture is adaptable to both shade and sun, and when the ryegrass goes dormant, the bluegrass is just beginning to grow. Then, when the bluegrass goes dormant, the ryegrass begins to grow.
Hope this information is helpful!
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