I worked in the mushroom manure using the same method I had with the sand. I chose mushroom manure not only to break up the soil, but also to add lots of nutrients.
In the western USA where many rhododendrons are planted in very acidic forest soil, an application of Dolomite and a light topdressing of mushroom manure in late spring is all they need. Sprinkle the lime on in late winter, very early spring.
No herbicides or pesticides are used on the garden, which was planted in early 1995. "We use no sprays or growth enhancers," says Nagata, who reports that the garden is nourished with mushroom manure and red worm compost.
Add organic matter such as manure or compost to the planting holes. Dehydrated manure is fine and is available in bags for a couple of bucks. I pay about $25 for a load of mushroom manure dumped into my pickup.
 See also: Manure, Mushroom, Plant, Soil, Growing
  
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