This is an interesting form.
i just looked it up on google
So your poem has the three elements in the first and second three lines. And the seventh line acts well as the narrative summary.
It seems to work fine on that score. Perhaps though the metre is not that regular. It is almost iambic in the first six lines, though not quite. And it might feel more rounded if the final lilne were also iambic.
I like line five where I get the mysterious feeling that the rules talk about. I think I detect a story not fully disclosed there with zilch remaining to 'spoil the plot'.
and I found 'next year they'll propogate' had possible layered meanings too.
I agree 'lavender beds' is much smoother.
I can't make sensible suggestions about metre, but yo perhaps it would help to make it more regular.
Thanks for introducing the form.
I can see this is going to be fun to work with.
Much harder than it first appears too.
Jenni