Newly seeded lawn - Knowledgebase Question

WOODBURY, Ne
Question by pooch_1972
March 11, 2009
I seeded a new lawn last year during the fall.I unfortunately had to do it at the tail end of the prime season,when the temperature started getting colder and I'm not sure all the seeds germinated because it still looks sparse.Now with spring coming,I'm not sure if I need to overseed or if the grass will fill in on it's own right away as the weather gets warmer.Also do I use crabgrass control yet?


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Answer from NGA
March 11, 2009

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I'm afraid you'll have to decide which is more important - overseeding your thin lawn or applying a crabgrass preventer. If you use crabgrass control now, you should not overseed until this fall. If you overseed now, you shouldn't use crabgrass contol now.

Crabgrass starts germinating when soil temperatures are 50 to 55 degrees F for ten or more days and germination can take place over 6 weeks. Pre-emergence herbicides provide excellent weed control for crabgrass. The compound doesn't prevent the weed seed from germinating, but kills the newly sprouted seedling. Late April to early May is an ideal time to apply pre-emergence control. Proper lawn maintenance practices limit crabgrass invasions. A dense stand of turfgrass prevents the weed from germinating and establishing. Fertilize at the end of May and remember that fall fertilizing, overseeding, aeration and thatch control can limit spring problems.

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