Most countries have strict laws against the importation of plants from one country to another (in the U.S. there are even restrictions on taking certain plants from state to state). This is because of the dangers that can be caused to the ecosystem due to pests, diseases, and the plants themselves when introduced into a non-native location. The point is, it's highly likely that you are unable to import/ship plants to Costa Rica at all.
Per Costa Rica law: All vegetable products such as plants (seeds, slips, whole plants, etc.), edible vegetables (grains, fruits, vegetables, roots, tubers, etc.), and by-products of plant origin (flours, nuts, etc.) require prior phytosanitary import approval by the Ministry of Agriculture and Livestock, with the exception of by-products that don't present any phytosanitary risk due to their nature or the transformation process they underwent, such as dried or frozen fruit, enriched flour, ground spices, etc.