I experiment with many different herbs for many different purposes. I have found taking Pine Pollen to improve erection strength. It does not create a size increase but there's a definite density increase. It's also good for other things, it's a complete protein with all amino acids and a natural source of testosterone; I like to take it before exercising. I've been taking it for years with no negative side effects, love the stuff
there's rumors about other herbs, like Cistanche which I've never tried, or like Ginkgo, which I like for its taste and the mental clarity, however my dick remains the size my parents genetically designed it to be.
Tongkat Ali did make my balls notably bigger, but also made them feel achey so I don't like to take it that often, and my balls are all ready above average.
I wouldn't trust anything called "Savage Grow Plus", for penis enlargement is the most lucrative category in the snake oil market that has ever existed. I don't want to be played like a chump so I don't buy things that are marketed that way. I do have a love of botany and aphrodisiacs do exist in nature, and I've always liked experimenting with different things to examine their effects. Nothing's made me grow in size but Pine Pollen's the one thing I'd recommend if you want rock hard erections.