I think this works:

>! Start with a construction that actually has too many rows (in this case, 20):<p>
>! ![1]<p>
>! And then move one of the trees so that it breaks 2 of the rows but preserves the rest. In this case, I moved point A a little further out so it was no longer in line with the two sides of the red square:<p>
>! ![2]<p>

Edited to add:

>! There is this, which is perhaps a bit prettier:<p>
>! ![3]<p>

Or this pinwheel I made:

>! ![4]


  [1]: https://i.sstatic.net/I5Wfs.png
  [2]: https://i.sstatic.net/kfVhk.png
  [3]: https://i.sstatic.net/vOcFG.png
  [4]: https://media2.giphy.com/media/Vt8ENsAjn8SnVtd8XB/giphy.gif?cid=790b76115ab5ade96b270ff5bd38fd70a6b7aa83a1ab5868&rid=giphy.gif&ct=g