This starts with two Clip Leaves from the Miniso Toys Sunflower set. The next piece is the Pin Connector w/4 Clips from the Miniso Toys Multiflora Rose set. The next piece is three 1x1x2 Round Bricks from the Brix Record Player set. This gives us a 1 Hit tree that is 21 feet tall and roughly 37.5 feet from branchtip to branchtip in 6P scale. Granted, it costs $13.25 to build this but you also get four Frames and a ton of extra parts out of the deal.
You might even go a little crazy and buy a second Miniso Toys Sunflower set for two more Clip Leaves. We'll swap out a 1x1x2 Round Brick which changes the parts total to seven. This is still 1 Hit but the remaining 1x1x2 Round Brick is under the Height Minimum for Cover so it doesn't really matter. This version is roughly 30 feet tall and 25 feet wide in 6P scale. This version costs $18.25 to build this but you also get five Frames and even more extra parts out of the deal.
If we wanted to buff this up to a full 2 Hits we could add a 1x1x2 Round Brick back in and use four of the Brown 1x1 Round Plates from the Miniso Toys Sunflower set to expand the piece count to twelve. This also give us enough height so we can change the orientation of the Clip Leaves to give this version a different look than the others. This version is roughly 39 feet tall and 10 feet wide in 6P scale. It still costs $18.25 to build this but you also get five Frames and a lot of extra parts out of the deal.
Size comparison pictures with the usual suspects.