I've heard Kratom (Mitragyna speciosa) grows all over the place in Thailand, but it was made illegal there at some stage - but not everything that's illegal in Thailand ceases to exist in Thailand because of its legal status. What I'm getting at is it grows wild everywhere, not that it's safe to ask your local police cop where to obtain an illegal plant. Thailand and the Philippines seem like they would have a similar climate for growing the plant, but I read it didn't grow in the Philippines which doesn't make sense to me, but I couldn't find out the legal status or any more info because most of the websites I tried to visit which looked hopeful had viruses or trojans on them according to my antivirus software.
Edit:
https://www.erowid.org/plants/kratom/kratom_law.shtml is a good resource for all drugs, unfortunately no info specific to Philippines there.
PS: d_m, I can't send you a PM because you're too popular. Go on a site wide rant like I did last week or so in order to lose some of that popularity, or just delete some messages please.