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Miss removal
I have recently put evergreen complete 4 in 1 on my lawn, unfortunately I think I may have put to much on, my lawn seems to be looking very sorry for itself now. I have raked out the black stuff left behind but my lawn looks extremely patchy, I put the 4 in 1 on about 2 weeks ago, I have watered it in very well plus a few bouts of rainfall. I'm wondering how long should I leave it before I sow grass seed. Any help would be gratefully received. Thanks in advance.
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It's always best to follow the instructions as the product will have undergone extensive trials before hitting the shelves. Residual weed and feed chemicals will adversely affect seed germination and the growth of the tiny seedlings.
Patience is a virtue in gardening. Take the time to let the product dissipate then prepare the soil well to make it favourable for seeding and water it well if there's been a dry spell and then sow.
This site contains some useful tips on successful lawn sowing - http://www.garden-counselor-lawn-care.com/grass-seed-germination.html
I listened to GQT this afternoon and there was Bob Flowerdew with a tip for reseeding patches in lawns when you need to do it after the optimum time of sowing in April. - Sow seed in cellular trays of compost about an inch deep and grow the babies on till they have good root systems and then plant the wee plugs in bare patches in your lawn.
Should work well for you having to wait 8 weeks before you can swo.
I've only ever sown a large lawn in one go but, logically, it will depend on how many bare patches you have and how big they are but I would suggest starting with trays of 24 one to two inch cells of grass babies. When they have a good root system, plant them out 3 to 4 inches apart and water in well.
Keep them watered and let them establish before you start mowing them. Set the blades high at 2" for their first summer so they have enough leaf to provide energy to send the roots down deep and sustain the plants through their first winter and future droughts. Strong roots also help fight off weeds.