HardyVermont, I have never seen (other than your post) where HO cannot be applied until 6 weeks since last application. I do not know the purity of Southern Ag's HO product as I have never purchased the product, Perhaps that is the reason for their caution.. I use Ultra Pure HO, which is the most purified HO on the market. I have spayed it for years and years several times in the same week, specially when a tree is flushing new growth, so that the leaves do not develop all twisted and deformed from aphids, and thrips feeding on them,. I just don't care for the smell of neem, particularly when spraying inside a greenhouse or home. By the way, it is GREAT seeing you on the forum.