I read at various places to not put tall fescue seed in a kentucky bluegrass lawn. My question is this: I think I have a lawn filled with K31 tall fescue. Is ok to reseed it with a newer variety or should I stick to K31 for a more uniform appearance? Thanks.
Nope, they sell them blended for seeding. I've used tons..the more blue you add, the more it costs. Tall Fescue doesn't spread much..one seed = one plant..sorta.
The issue with mixing kentucky blue grass and tall fescue is that as Peter pointed out, tall fescue is a larger blade grass and grows faster, tending to crowd out the blue grass. However, there are newer varieties of tall fescue like Duster or Montauk, that have finer blades and are slower growing. Those should be better at blending with blue grass.
It all depends what you like and what you are trying to do. K31 is a coarser tall fescue, but I don;t think it will crowd out one of the newer finer blade varieties because they are still similar grasses. If you are satisfied with how your lawn looks, but want to fill in areas, thicken it, then you can probably overseed with one of the newer tall fescues or just use K31. I wouldn't use the newer one in an area like one big empty spot without K31 too, because then you will likely notice a difference.
If you want a different, finer look, better color, less mowing, disease/insect resistance, etc, then killing it and starting over is the way to go.
Along the way, I'd test the soil and make sure you have the right PH, etc. I'd use a slice seeder and wait till fall.
I consider K31 part of the Al-Quaeda network and attempt to eradicate it wherever it hides and replace it with a multicultural, democratic society of Turf type tall fescue and bluegrass.
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