On 8 Nov 05 at 14:13, J.E. Shields wrote: > Chemistry 101 note: pH is the hydrogen ion potential, or > acidity. pH 7 is considered neutral (neither acid nor > alkaline) and is the pH of ultrapure water. pH values below 7 > are considered acid, while pH values above 7 are considered > alkaline. But for horticultural purposes, pH 6.5 is considered neutral. (Now that we've got them all completely confused, you hold 'em while I steal their wallets.) -- Rodger Whitlock Victoria, British Columbia, Canada Maritime Zone 8, a cool Mediterranean climate on beautiful Vancouver Island