A subtropical climate is not conducive to growing French lavender.
I have followed all the rules, not too wet, don’t dry out, soil nutrient, trim regularly, but haven’t had much success.
This year I let my lavender shrub do its own thing.
Although the flowers and leaves are not as big or lustrous as those in designer gardens, the mauve flowers and soft leaves do have a lovely fragrance.
The big bonus is busy bees like my lavender!
♥ Gretchen Bernet-Ward