[mdjlucan]

Lavender Why is my lavender only popping up a few flower stems

[New shoot]

Do you feed it at all?  Plants in pots use up all the nutrients in the compost and sometimes don't flower as well as they did.  Any general purpose feed would do, but you could also use tomato feed.

The other reason can be lack of sun.  Lavender likes full sun so sometimes refuses to flower in part shade.

[mdjlucan]

Is this feed okay

[New shoot]

That would be fine.