Milkweed Seeds in the UK

Hello - we are interested in helping the butterflies by planting Milkweed Seeds. We are in the United Kingdom, so can you advise on types of seeds and the cost.

Karen says:
My favorite milkweeds are tropical milkweed or Asclepias curassavica which is very easy to start from seed and an annual in most locations (I'm guessing all of the UK) and Asclepias incarnata or swamp milkweed which is a perennial here.

Here is a link for Milkweed Seeds in the UK. I hope it helps!