A very cool post! Who'd have thought...? like really! The catkins remind me of young green peppercorns on the pepper trees here in Thailand. Walnuts? You need a small mortgage to buy them here. NICE contribution to our natural world knowledge - and lush and lovely and made me want garden time. Hope to see you posting under the 
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RE: I bet you didn't know this Fact about the Walnut Tree.