ibartoo, they may take a little longer as they are old.
One could try watering with 1 teaspoon of 70% isopropyl rubbing alcohol (common over the counter) to 16 oz of water and see if this helps.

I agree some of the older ones do take a bit longer..
The darker color is not an indication of age.. some are light some are dark and come in different sizes.. LOL those small seeds are a chore to peel...Karma what does the alcohol do???
Kylie

I am so glad you ask this Linda. I was wondering the same thing. I have some I am still waiting on...Thanks karma I will try the 70% isopropyl rubbing alcohol trick...

I've got the same problem with my Brugmansia arborea seeds. I sowed them in four batches from mid-Nov last year to 22 Jan this year (it's now summer here in Australia, so weather is consistently warm to hot). Most were soaked and peeled; sown in different types of potting mixes; in different pots; placed in different parts of the garden with different light levels; not allowed to dry out and I don't think overwatered. Not one has germinated! OK, maybe a few were over/underwatered or eaten by slugs or something, but not ALL OF THEM, surely?

I haven't had this problem with other brug seeds (including some sanguinea seeds that I'd had for several years)--never had NOT ONE germinate, and from so many sowings. They all came from one local supplier. Arborea seeds are hard to come by here because they cannot be imported so must come from trees already in the country. Would I be right in thinking that they're just old? Is there still some hope that at least ONE of them might yet germinate?

B. Arborea are ones that can take up to 6 or more months to sprout. Old or not these are the hardest to get started. Best of luck!!

I have real good luck with soaking them in super thrive and water. Some of them I soak as long as three days, and occ. I'll see them trying to germinate in the water. Then other times, some seeds are just stubborn. I planted some seeds 11-15 that were dated 2007, and just today I saw a couple trying to come up. You just never know.. LOL

Thanks everyone, I will try your tips and let you know which ones work for me. I guess I should be more patient. LOL

Linda

So, immense patience is required for germinating arborea seeds. Had no idea they might take that long (sigh). Ironical if they all end up germinating, given that I need only one plant ...