Andy's orchids has a feature of their advanced search that lets you search by country. There is a whole page of orchids that he lists as from Costa Rica. But of course this is only a miniscule selection of the richness of Costa Rican flora.
I agree though that if you are growing orchids outside, there is little to be concerned about. In the US, only a small portion of the plants available at a garden center are actually native species. There are some examples of plants that have become invasive after escaping cultivation, but this is a relatively rare occurance, usually only occurs in plants that reproduce rapidly, and as ES points out, orchids usually require specific conditions to reproduce. For example, Wild Parsnip (Pastinaca sativa) is thought to have escaped cultivation when it was brought over from Europe, but each plant can produce 1000 wind-dispersed seeds which readily germinate. Other problem invasives will reproduce complete plants from pieces of stems, seeds, or roots.
Orchids just don't have these mass reproduction strategies, which is part of why so many species are rare or extinct.
Having responsibly sourced native species in your garden or outdoor areas is a wonderful idea though, it helps preserve these species and can provide habitat for native insects and animals.
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