It's not perfect, but a little tlc and it will be 'fine'. On the assumption you don't want a bowling green. Not that you should have to put up with sub-standard workmanship of course. If you get a topsoil / compost mix with seed into those gaps they'll be gone in 3 weeks. The exposed edges will dry out if not, and you'll have more problems including shrinkage which will exacerbate the problem. Keep it well watered but ensure this is in the daytime not the evenings. That just leads to disease. Be careful not to wash the soil / seed mix away.
Thanks Dave, is there any off the shelf products you’d recommend for the top soil & seed mix?
We’ve been watering the garden early morning and late at night; interesting your comment about diseases as I wasn’t aware. It’s been really hot most days with long sun exposure.
Grass will grow anywhere! In all seriousness, it's not that critical. A mix of topsoil and sand (nor builders sand) or compost and away you go. A 50/50 mix or something along those lines. Mix the grass seed in with it and press it in quite firmly. If you do it when the grass and soil are dry it will 'pour' in more easily. Keep it little watered (fine spray rather than jet) to keep the seeds in contact with the seed bed.
Yes, it seems counter-intuitive to water in the mornings but that is the recommendation by the turf care industry. Problem with watering in the evening is the moisture stays in the grass and can give rise to many lawn disease issues. Red Thread being one of them. It does grow out in time though. You'll often notice here in the UK that many lawns get red thread and this is due to our high humidity.
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Yes, it seems counter-intuitive to water in the mornings but that is the recommendation by the turf care industry. Problem with watering in the evening is the moisture stays in the grass and can give rise to many lawn disease issues. Red Thread being one of them. It does grow out in time though. You'll often notice here in the UK that many lawns get red thread and this is due to our high humidity.