Sounds like you are on the right track. In my experience, I'd probably start with something like 5-2-1, or 4-2-1. I just mixed up some yesterday, and went with 4-2-1 for additional water retention. With blueberries the extra water retention is needed. As far as the drain holes, more is not better. The same amount will drain through 5 holes as 10. Just put as many as you are comfortable with. Fertilizing, you will probably get many suggestions. Personally, I'd save the organics for the ground where it will break down properly. A controlled release chemical fertilizer like Miracle Gro shake and feed for vegetables is a good addition to the mix at the start. It has the micronutrients and calcium. I'd add 1 teaspoon per gallon of mix. Blueberries don't need much fertilizing. What size/how old are the plants and how big are your containers? A lot of us fertilize with ammonium sulfate as they begin to take off. You'll probably get more suggestions. Just my .02 for now. There are many many threads on growing blueberries in containers here and over on the fruits forum. Where are you?. Adding you Zone to your profile is helpful.

Thank you for the response! The blueberry plants are about 4 or 5 inches tall. The container is about 18 inches wide by 15 inches high.

Is the fertilizer I have not good for initial fertilization? I've read to give 3 feedings at 1 1/2 cup each (Feb, May, August). I've also read not to fertilize past August. My question would be - does this mean I would just combine 1 1/2 cup x 2 = 24oz.. Then divide that by X amount of weeks until Aug/Sept for my weekly fertilization?

Thanks again,
Richard

The fertilizer you have is organic, and would probably be best suited for the ground where it could break down properly. Container fertilization when using a soilless mix is a bit different ballgame. If you use a liquid or water soluble chemical fertilizer the nutrients will be available immediately to the plant. Since your plants are very small they don't need very much fertilizer at all anyway. You can add a little fertilizer to the mix at the start if you want, but it's really not necessary. If they were my plants I would probably mix a "little" Controlled Release Fertilizer (like MG Shake and Feed, which has all the nutrients,) to the mix at the beginning. Then, once the plants get establisked, I would give gentle weekly feedings of water soluble ammonium sulfate 21-0-0. Again, I suggest reading up on blueberry fertilization until you feel more comfortable with it. I can definitely relate to it being overwhelming at the beginning, but you will figure it out eventually. Your mix sounds good, now all you have to do is figure out the fertilizer part. It wouldn't hurt to just pot them up now, and add the fertilizer a little later. Where are you located? No fertilizer after August because the plants need to begin to go dormant rather than force new growth.

Ah OK. Does it hurt to use the organic feet? I have a whole bag. :-D maybe I'll just use it for something else. I live in NYC.