Help With New Sod - Knowledgebase Question

Providence, RI (Zone 6A)
Avatar for ecuello
Question by ecuello
July 15, 2005
About three weeks ago I turned the dirt in my yard, planted seeds and then laid sod down. I water the yard on a regular basis but, it seems to get me no where. About 70% of the sod has just died while some areas are growing strong. Is there any way I can repair the sod or do I have to start from scratch? Why won't the seeds grow through? Help!!

Answer from NGA
July 15, 2005
I understand your desire for a lush, thick lawn, but seeding the area and then covering it with sod is a waste of time and effort. The seeds will sprout in moist conditions, but the little blades will have a terrible time trying to work their way up through the roots of the sod. Grass seeds need to be sown directly on the soil surface where they can reach the sunlight quickly - before they run out of energy. It would be better to throw seeds on top of the sod than to bury them under the sod.
I really wouldn't recommend both seed and sod - I'd do one or the other. The second problem you may be encountering is that mid-summer is not a good time to seed or sod a new lawn. The weather is just too sunny and hot for either to grow well. You'll have much greater success in the early spring or fall when temperatures are cool and rainfall abundant.

Usually, sod will start to root within a week or so and attaches itself pretty firmly (so it's not liftable) in four to six weeks. Without knowing how you prepared the soil ahead of time or how you initially laid and rolled the sod it is hard to diagnose what the problem is. Ideally, the soil beneath the sod would have been deeply prepared with amendments and any fertilizers added as per soil test results and watered so that it was damp ahead of time, then the sod laid, rolled to assure good root to soil contact and immediately watered very deeply to about eight inches down. Next, you would water daily but lightly for about a week until it began to root, then back off slightly with the watering as the roots grow deeper. After a few weeks, watering would be about twice a week. Eventually it is tight to the ground and that is when you can walk on it or use it. Watering can be tricky. You need to keep the roots and top layer of soil moist yet not turn the whole thing into a soggy muddy mess because saturated soil will inhibit rooting. On the other hand, so will dry soil. It is also possible that you have literally pulled up the sod or hindered rooting by mowing too soon. Mowing new sod can be nerve wracking. It is better to let it grow very tall than mow too early! Mowing too short also slows rooting. Finally, if the grass ends up being very tall before you can mow it, then you have to bring the height down gradually by no more than a third at a time so as not to shock it. If you are concerned about the quality of the sod, you might contact the supplier. If you have concerns about the soil in your yard, you might consult with your County Extension for information about soil testing as well as any special localized conditions affecting sod establishment. Good luck with that lawn!

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