Grass problems - too much rain?

mag9977May 26, 2012

I am in Seattle and at the end of April I had my lawn thatched ,fertilized (lawn guy took 3 trucks loads of thatch to the dump) my yard is probably 1000sq feet. I had him come back last Saturday to overseed, and it has poured rain ever since.Today the sun is finally up. I can see the seed still on the ground, but nothing is happening. It is possible it got too wet? Or so I need to be more patient?

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tiemco

Depends on what type of seed he put down and what your soil temps are. If he used perennial rye, I would expect you to seed some germination by now unless it has been very cool. Tall fescue takes 5-15 days to germinate, but again, cooler temps mean longer germination. Kentucky bluegrass can take weeks. Seeds that are too wet can rot, and a lot of rain can move seeds around quite a bit, causing patches of really thick grass, and patches of no new grass. I would look at your seeds to see what they look like. If they look soft, dark, and waterlogged, they might be rotting. If they look moist and swelled with some whitish hairs coming out, then they are fine and germination has started. If you don't see hairs then be sure to keep them continually moist because if they dry out they will be worthless.

    Bookmark   May 26, 2012 at 12:55PM
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mag9977

he used Pennington "smart seed" pacific NW mix 34% 1g squared perennial ryegrass, 34% APR 2105 perennal ryegrass, 14.5% 7-seas chewings fescue and 14.5 razor red rescue. rygrass germination 90% and the fescue is 85%.

The seeds actually look the same as they did when they came out of the bag. I do recal there being a blue colour to them and that has washed away.

    Bookmark   May 26, 2012 at 1:28PM
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tiemco

I would expect to see some germination from the PR already, the fine fescues take longer. What have your daily high temps been in the past two weeks?

    Bookmark   May 26, 2012 at 4:17PM
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mag9977

It has been 5-10 degrees Celsius. Today and tomorrow up to 20 and then to mid teens this week.

    Bookmark   May 26, 2012 at 7:17PM
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mag9977

It has been 5-10 degrees Celsius. Today and tomorrow up to 20 and then to mid teens this week.

    Bookmark   May 26, 2012 at 7:39PM
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tiemco

That's a big part of your problem, 5-10 degrees C (41-50 F) is pretty low, it means your soil temps are probably borderline for germination. Take your soil's temperature with an instant read thermometer. 50 degrees is the bare minimum for germination, 55 is much better, but germination will still be slow. The other issues are rain and lack of sun. Rain cools the soil, and the lack of solar radiation isn't helping temps either.

    Bookmark   May 26, 2012 at 8:49PM
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dchall_san_antonio(8 San Antonio)

Do they measure temp in degrees C in Seattle?

You've had ideal conditions for seed to sprout. Is there anything you're leaving out?

    Bookmark   May 26, 2012 at 11:00PM
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mag9977

"They" don't measure temp in Seattle as C, but I do as I am not American.

The only other thing that may have made a difference I forgot to mention, when he thatched back in April he also put a moss killer in my lawn. Unless he did something I was not aware of that could effect my lawn. I did notice he did not put something on top of the seed (peat moss etc) he said since it was going to be wet over the course of the week it wouldn't be necessary. Thats is all I can think of.

    Bookmark   May 26, 2012 at 11:21PM
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mag9977

It has been 5-10 degrees Celsius. Today and tomorrow up to 20 and then to mid teens this week.

    Bookmark   May 27, 2012 at 1:13PM
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