PH balance in the soil

PH balance in the soil

Last autumn my partner and I created an ericaceous bed in the center of our garden in London. The soil is naturally very alkaline - but we love blueberrys and hydrangeas so we dug in lots of ericaceous compost and built the new raised bed. A soil test this spring shows that while heading in the right PH direction, the soil is still a little more alkaline that acid. Yesterday we applied ammonia sulphate at the recommended rate across the bed. Does anyone know how soon we can re-apply? Or of any other tricks to bring down the PH in this island bed? Thanks
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Autumn’s Place

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Blooming!

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newbie

Water plant ID

Water plant ID