The seed packet don't say if they need chlll treatment.
I'm looking at the Butterfly Flower (Asclepias tuberrosa L) and it doesn't mention the chilling.
This is what sprouted in 5 days. I do have a self-water seed starter and it keeps the soil moist.
I may have read about chilling on the swamp seeds that I planted.
However, they both are sprouting.
I'd say that the butterfly flower is sprouting much quicker. Probably after 5 days, I saw sprouts.
The swamp milk weed is a little slower, but seems to be getting a large number that are sprouting now.
The seed packets that I received from Monarch watch, all saw except for one to cold-stratify for at least 6 weeks before planting for best germination. I guess, I should go ahead and put them in fridge. At least if they are only there a week, everyday helps. LOL, more unidentified things in fridge.....
Butterfly weed: Asclepias tuberosa
Swamp weed: Asclepia incarnata subsp. incarnata
Common Milkweed: Asclepias syriaca
No mention of cold-stratify on packet
Tropical Milkweed: Asclepias curassavica
The more you learn about the Monarch butterfly, the more you find out there is learn. It seems learning about the Monarch butterfly covers so many topics.
Saving one egg, cat and butterfly at a time