Digging Hebridean Horticultural into acid, sticky clay soils helps alkalinity and aeration.
In sandy soils it helps restore the balance of nutrients and water retention.
The polysaccharides in seaweed flocculate clay causing it to crumble, and bind together sandy particles aiding water retention.
As little as 0.1% in the soil has been shown to increase soil aeration in clay and water retention in sandy soils by up to 10%.
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In a small garden a 25kg bag twice a year can be sufficient to make a marked improvement.