Sharon, they were open today. Unfortunately I have been too busy to respond. I was out of town this weekend and worked in the yard today. I did in fact go to Wentworth Greenhouse today for some perennials. As Jonathan pointed out, it is best to call them to get this kind of information, especially to get the most timely information on a long holiday weekend.
Have you ever heard of the phone app on your phone? It allows one to call businesses directly, instead of asking questions that the business in question will never see.
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