"Nicks40" wrote

We're going to Costa Rica April/May for 3 weeks on a naturalist tour
of most of the country.

We are keen gardeners in England, in US terms about zone 9, and would
like suggestions as to what we could usefully bring back for the
outdoor garden. Seeds, not plants obviously. We have plenty of space,
our site is exposed to the wind, but only gets a degree or two below
freezing at worst.

There probably aren't many seeds you can't obtain from mail order or
online. I would concentrate on getting local lore on plants you see
and fancy. Keep in mind that "a degree or 2 below freezing" is fatal
to many/most tropicals.