Whats wrong with this bitch? help please.

Can someone please help me diagnose this problem? Ive read the plant problem thread but it seems like the deficiencies are all almost the same and can be caused by multiple things...so I dont know exactley what the problem is, Im thinkin' PH maybe, cuz i have never bothered to check PH and it might be time, the leaves are curling under, and a couple of the leaves are gettin yellow/brown...

Anyone?there in holes in the ground so I dont know if flushing would work like it would in pots..

Always Ph your water before watering. Add some nutrients, she will thank you soon.