That sounds like a beautiful mixture! I have experimented many times with mullein, peppermint, and lotus, but never passionflower, since harmalas are easy to acquire over the internet where I'm at (hence I love my 10x caapi
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Changa is a really beautiful and different experience relative to straight freebase. I wouldn't call it less powerful, I would just call it a different path to hyperspace and healing. I'm sure you could go directly to hyperspace with one huge toke out of a GVG or bong, but I prefer changa because of its ability to allow you to slowly dip yourself into other realms.
I also like changa because you don't have to be as careful with dosage. I almost always weigh out my FB, but I just pinch whatever amount of Changa feels right in my GVG and go from there. This makes a big difference when it comes to multi-hour sessions, since it is much easier to pinch some more changa into a GVG while half way into hyperspace than it is to pull out a mg scale and fb xtals.
1:1 is a great ratio, and will be quite strong. I've made blends that I think are as low as 5:1 (plant to spice), and they are perfect for concerts or group meditation sessions.
Good luck! Peace and Happy Journeys
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