Hi Jan,
We've got a Classifieds section for any for sale/trade/wanted/giveaway items, but that requires a minimum of 10 posts to make an entry, as we want to restrict trading to active members (as we can't vet sellers, this is one way of making a hurdle for people using the site as an ad platform).
As other members have suggested, it's unlikely that you'll get any takers for your offer of plant sharing via e-mail - as we're a community forum, where the main purpose is interaction on the site. I'm sure you're trying to be helpful by sharing plants for postage, but it poses a problem when it's not conducted via the site, so I'm locking this thread.