B & J said:

The answers you received sounded right. Go for it because the plant is a
goner anyway. I was given a couple of seedlings by a fellow gardener that
came up under her plant and have two plants that bloom and increase in size
every year but haven't had any progeny sprout under them, a minus because I
want more.

I tried collecting, saving, and planting seeds, but none of them grew. I
might add that I collected seeds from a white milkweed with the same
results. Does anyone have a formula for making these seeds grow?

Easy to grow from tip cuttings. Root the cuttings in damp sand. Keep
them in a shaded area. Cover each pot with cutting with a plastic bag.
Use short stakes to hold the bags up and away from the cuttings. Cuttings
taken in June should root in time to plant in early September.

I've started getting seedling appearing here and there, but my first plant
(bare root) was the 'mother' to a number of babies through cuttings.
--
Pat in Plymouth MI

Any technology distinguishable from magic is insufficiently advanced.
(attributed to Don Marti)