Also -- I have read that there is a correlation of the use of Bone Meal (Gardeners use this to make their roses pretty) and patients with Alzheimers. Bone meal is ground up cow bones and the dust can be toxin.
I can't remember the author but the author did not that there was a high statistic occurance with those people who used Bone Meal and those who now have Alzheimers.
Alzheimers is a very sad brain disease and my sympathies to you and your family who have to watch a love one suffer through this.