Magnesium nitrate is a fairly common source of the two cations in
fertilizers. It is, I believe, the primary mag provider in the Greencare
MSU formulation.

For pure stuff, you'd probably have to go to a chemical supply house or a
fertilizer manufacturer.

--

Ray Barkalow - First Rays Orchids - www.firstrays.com
Plants, Supplies, Artwork, Books and Lots of Free Info!


"cvandyke" wrote in message
]...
Does anyone know where I can purchase a chemical called 'Magnisal'
(magnesium nitrate). A grower at the Eric Young Orchid Foundation
strongly recommended it to me (over Epsom Salt) for improving the quality
of my phragmipediums. The
nitrate in Magnisal has been found to facilitate and accelerate magnesium
uptake by the plant leading to healthy plant development.

Thanks

Charles VanDyke