I would probably use a generic 5-10-10 vegetable food
that lacks calcium for fertilizer in a BER test. Likely
national brands (that can be found anywhere in the
country):
Garden Rite 6-10-10 (RiteAid house brand):
http://agr.wa.gov/PestFert/Fertilize...asp?pname=4023
Shultz 9-10-15 Tomato Plus Plant Food (probably at HD):
http://agr.wa.gov/PestFert/Fertilize...asp?pname=2258
Turfking Tomato & Vegetable Food 4-10-10:
http://agr.wa.gov/PestFert/Fertilize...asp?pname=2882
These all contain calcium (so avoid for this test):
Greenall (E.B. Stone; 8%)
MorCrop (Lilly Miller; 4%)
Lilly Miller Vegetable Food (Lilly Miller; 4%)
Lilly Miller Bulb & Bloom(4-10-10; Lilly Miller; 6%)
Master Nursery (E.B. Stone; 7%)
(If you want to look anything up in the WA State
fertilizer db:
http://agr.wa.gov/PestFert/Fertilize...ctDatabase.htm
)
Edit:
Those Purple Haze plants are rare, and I would treat them
accordingly: test the pH in the container mix before adding lime,
add gypsum, use your best fertilizer, use Daconil, give them your
best spot on the deck, hire an armed guard, etc.