Hahaha, I'm glad I caught this thread. That Miracle-Gro potting soil [ I'm assuming the three month continuous feed crap ] isn't as good as everyone says, and it's not as bad either. Every plant I've grown to maturity in Miracle-Gro soil depleted the soil of nutrients at least a month before those three months were up.

Ingredients: This product is formulated from forest products
compost and Canadian sphagnum peat moss, perlite,
a wetting agent, and fertilizer (see below).
In Georgia, this product is formulated from 50-60% forest
products compost, and Canadian sphagnum peat moss,
perlite, a wetting agent and fertilizer (see below).

Miracle-Gro Potting Mix, 0.21 - 0.07 - 0.14
Total nitrogen (N)* ......................0.21%
0.12% ammoniacal nitrogen
0.09% nitrate nitrogen
Available phosphate (P2O5)*..........0.07%
Soluble potash (K2O).....................0.14%

Derived from: Coated and uncoated: ammonium nitrate,
ammonium phosphate, calcium phosphate, and
potassion sulfate.

*A portion of the nitrogen, phosphate and potash has been
coated to provide 0.15% coated slow release nitrogen (N), 0.03%
coated slow release available phosphate(P2O5) coated
slow release soluble potash(K2O).

Anyone see what I mean? An NPK of .21-.07-.14! That's less than 1-1-1 for the seriously decimal illiterate --- the highest thing in it, Nitrogen, is at twenty-one hundredths of one percent. And the slow release formula capsules are even less! With that said, I might also add that I had to fertilize them after they began showing signs of nutrient deficieny in the middle of flowering, so I fed them some of Miracle-Gro's other products [ Miracle-Gro Expert Gardener All Purpose Plant Food (15-30-15) and Miracle-Gro Bloom Booster Flower Food (10-52-10)], and they turned out great. I managed to pick up a third recently, Miracle-Gro Azalea/Camellia/Rhododendron Plant Food 30-10-10, which I will be using for my next grow in unison with the other two --- that is, 15-30-15/30-10-10 [ Vegetative ] and 15-30-15/10-52-10 [ Flowering ].