Instruct: Classify a given review into positive or negative sentiment.
Query: 30 years

I used it a lifetime ago for a few years when the trees were stressed from constuction and the landscaping was new. All survived and winters in central New York were rugged. A couple of trees need help and winter is on the way. The concentrate needs to be diluted and a tank or appropriate hose end sprayer would work. Non-toxic and non-messy. Louis