Brian Mailman wrote:

> George Shirley wrote:
>
>
>>Epsom salts are salts of magnesium, an essential thing that most plants
>>need and don't get enough of in our soils. A tablespoon or two in the
>>planting hole will help about any plant but does wonders for tomatoes,
>>peppers, and roses.
>
>
> Hydrangeas, too. I forget if it's for the pink color or the deep blue.
>
> B/

Turn them blue with acidic materials, turn them pink with alkaline. We
have old ones planted around the edge of the house and the slab tends to
turn them pink. I feed them aluminum sulfate to keep them blue, usually
every two to three years works.

George