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Hi Glen,
Seaweed meal is a good gentle feed for the lawn in the long term but it could be expensive! It will not provide much in the way of NPK so it can't really replace a mineral feed as such, but it will help with soil conditioning and water retention in the long term leading to a healthy lawn.
You can apply any time of year, it will not scorch. You'll get the best results in the spring and autumn. It won't do a lot in the winter.
On watering it will usually swell up and become jelly-like. The bacteria and fungi in the soil will have a great old time breaking it down over 3/4 days. It's best to apply to a recently cut lawn that is dry as you want the product to get through the leaves to the soil surface. Once it's there you will not notice it.
Please stay away from "calcified seaweed" (aka Maerl https://en.wikipedia.org/wiki/Maerl). Harvesting it is dreadful for the environment and there are more sustainable forms of calcium available for fertilising.
Thanks for that Daisy. Not quite the product I was hoping it would be in this instance, but certainly something I'll consider as an early season conditioner in the future.
Have you thought of next best option and a liquid seaweed? There are lots about and various claims/ counter claims but regular use - (little & often) does improve soil health and a foliar application has been linked to increased disease/ fungal resistance. Certainly red thread treatment & prevention will be improved by liquid seaweed. Not a growth stimulant or energy source like a fertiliser but improving the soil = improves the crop (grass lawn)....
Richard@Progreen
Sorry I didn't respond sooner, but thanks for all the info.