i think those brown spots look like a calcium/magnesium deficiency.
here are some of the signs of Calcium deficiency
Older leaves will be getting brown spots, and newer leaves might appear misshapen.
Apart from these brown spots, you may also notice:
- Foliage is beginning to wilt
- Sluggish flowering stages
- Leaf tips are starting to curl
- Weak or hollow stems
- Roots that are short and dry
- There is a general smallness to both leaves and buds