I like to know when they were harvested, but it really comes down to how the tea tastes. Spring teas are generally the best, but not always. Sometimes the fall harvest surprises you and are better than the spring ones. It's rare, but it does happen. So, I picked maybe.
I'm always interested to know more about the tea I drink, so I prefer shops where I can get information about where and when it was picked. For green tea, I am reluctant to buy if this information is not available for reasons of freshness as well.
Not terribly important to me as I'll still be drinking tea during an off harvest. I trust that my tea vendors will find the best of what is available during a difficult year. However, the taste of teas that I receive will affect what I repurchase during the year.
The information about the tea I purchase is more and more important for me but it is not a criteria. This morning I opened YM supreme from o-cha. Many of you already wrote very nice things about this tea, and I must agree it kicks ass. I will play little bit with the brewing parameters than I will write my experience more in detail. Currently in work. For the evening I am planning to have mao jian.
Harvest information is important but wont nessecarily prevent me from buying a tea if i want to try it. I prefer to know when a tea was harvested because it can give an idea of freshness. I am less likely to buy from a vendor that does not provide harvest information, especially since joining teachat. But i do still buy from vendors like rishi and i just cleaned up at special teas close out clearance. I do think that harvest information increases a vendors credibility (assuming they are truthful).