Tom, We have tons of goldenrod here. I never harvested seed from them before so I looked it up and this is how one said to harvest the seeds.
"Goldenrod is super easy- wait until it has gone by (now?) and is mostly dry - cut the stems a couple of inches from the base and stuff the plant top down into a paper grocery bag (it won't take many to fill the bag)
Put the bag(s) in a well ventilated spot like a screened porch, shed, garage, whatever to let the plants dry out.
2 weeks or so later, take them out and whack the dried plants around where you want to place the goldenrod. Shake anything in the bag out as well.
You'll see goldenrod next fall."
I could probably send you some this fall since I doubt any seeds survived the winter. I'll check. If not, remind me in the fall and I will send you some.
