Here’s a few favorites of mine:
J.L. Hudson, Seedsman
P.O. Box 337
La Honda, CA 94020
No website - totally snail mail. Worth it, though - 95 illustration-free pages of rare seeds by botanical name.
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Irish Eyes Garden Seeds
http://www.irisheyesgardenseeds.com
Your potatoe headquarters; always pleased with their certified stock.
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St. Lawrence Nurseries
http://www.sln.potsdam.ny.us
Zone 3 nursery with nearly two hundred apple varieties. Other fruits, too, including a silver maple (A. saccharinum) cultivar that has twice the sap sugar content at 3-5% over the sugar maple (A. saccharum) around 2-2.5%.
Wow, thank you so much! All of those sound great.