How to overseed KBG
This post adresses how to integrate a new KBG cultivar into an existing KBG lawn or other existing established lawn.
If you want a lawn of pure KBG or want a KBG monostand, overseeding is not the route to take. You need to kill your existing lawn and renovate. You cannot convert an extabilshed lawn into a monostand or a fescue lawn into a KBG lawn by overseeding.
1. The new KBG seed needs every advantage to establish. This means that it will need good soil to seed contact and it will need to have little competition from the existing turf. You need to do considerable damage to the existing lawn to open access to the soil.
2. Scalp the existing lawn. Mow the lawn at the lowest level possible that does not "ground" the mower blade. Be aware, this will stess the current turf and may cause some existing turf loss.
3. Thatch the lawn. ( a verticutter/slit seeder can be used--depth of blades set at just below soil height). This will open up acess to the soil and open up the existing lawn to allow sunlight for the new seed.
4. Rake up the thatch/residue.
5. Spread the new KBG seed so that coverage is 1-3 lbs. per 1000 sp ft (1llb/k).
6. Make a pass with the verticutter/slitseeder set at 1/4" depth. If the lawn is sloped, make the pass at a 45 degree angle or parallel to the slope. If you are so inclined to accept additional damage to the existing lawn, make a second pass at a 45-90 degree angle to the first pass (depending on the sliope).
7. Apply a "starter" fertilizer. Optional: Apply Tenacity or apply Scott's Starter fertilizer with mesotrione to suppress weed germination. It is advised that waiting until the new seed has germinated befor applying a starter may reduce growth of the existing turf and reduce mowing.
8. Optional: Apply peat moss topdressing at a depth of no more than 1/4".
9. Water as recommended. (lightly 3-4 times a day until germination then as recommended on this site.)
- Keep existing turf cut. Mow carefully at 1" until new grass reaches same height as existing established turf. Carefully means 3 pt turns and soft walking without turning on heels or balls of feet.
This post was edited by grass1950 on Fri, Aug 30, 13 at 11:56