Fences don’t deter gardeners who have for generations found ways over, around and under barriers (both real and figurative) to share plants, tips and recipes — really, bits of ourselves and our cultures, without regard to another gardener’s stripes or background. Since a gardener can’t give or get plants without touching another person, our garden legacies have proven to be real common ground. Now, how about a piece of my grandma’s old rose for your fence…