Bottle Brush bushes give no seeds when chopped down?

[Hails]

I'm having a really hard time getting bottle brush seeds. I set up a wattle bush farm really easily but not bottle brushes. I definitely didn't chop all my bushes down but when I went back to the pine forest there were none and when I chop the bushes I have I get no seeds at all but with the wattle bushes I seem to get 1-2 every time. I just chopped down 3 bottle brush bushes and got no seeds...at this rate I'm going to have no bottle brush bushes left at all. Considering there is only a finite number of bottle brush bushes they should guarantee at least 1 seed every time. I was expecting it would take time to build up the amount of bottle brush bushes I want but I can't seem to do that at all let alone slowly, how am I supposed to make a farm of them if they give no seeds? I have less than 10 bottle brush bushes left with seemingly no way to get more....is it supposed to be this way?

[100% Recycled Awesome]

It's random between 0-3 seeds. However, if you give your newly planted bottle a few years and then cut them down, you can get more seeds that way. I moved my wattle/bottle farm and got a 132 more plants.

Alternatively, if you have a friend who plays the game, have them create a new map, join that and harvest all of the wattle and bottle plants on that map. They can always delete it. So in a sense, if you're willing to put the time in, you can get nearly infinite bottle and wattle plants, as well as old kangaroo signs, which are finite.