There is no such thing as a container being too deep for blueberries - but there are soils that are too heavy. If the soil is appropriate, a BB will colonize a 10' deep container from top to bottom - honest. ;o) From your description, it is certainly a water-retentive, poorly aerated soil causing your troubles. You can temporarily remedy that by adding a wick to the drain hole & allowing it to dangle below the container, or better yet - partially bury the container & let the earth do the wicking for you. I think you've probably done more than enough to maintain acidic soil conditions, too. Even blueberries will succumb to pH induced toxicities when pH drops to extreme lows, and poorly aerated soils reduce root function and create deficiencies of many of the most important nutrients. In short - you first need to reduce/correct the water retention issues of the soil and consider the rest secondary. Al

it takes weeks, even months for sulfur to take effect... and, what's more, here in fla it needs to be reapplied frequently (at least once a year). my bed went from 5.5 to 7 in a year. with just two plants, i would, were i you, consider 1) going to a nursery and buying a huge tree pot; 2) fill it to the top with pine nuggets; 3) dump in a mix of compost and peat--filling in the space among the nuggets (you'll be surprised how much will fit in there); 4) plant the blueberries together in the same pot.

Did a web SEARCH and found the following site as the first hit regarding SERENADE- http://www.serenadegarden.com/howto/FAQ.html Even on eBAY can you find this product. http://cgi.ebay.com/Serenade-Organic-Garden-Disease-Control-Spray-32-oz-RTU_W0QQitemZ320264801834QQcmdZViewItem?IMSfp=TL0806191277r7250 Most 'hardware' stores cater to people who use common (and mostly non organic based) chemicals in a garden, and would not sell such ORGANIC BASED products, so you would probably never see this there, unless another cusomer asked for it and they ordered it special. To find such products, you would have to locate sources that sell ALTERNATIVE products for ORGANIC control. The internet is obviously quite powerful in giving many choices of sources. Bt, is a good example as is Neem. Neither might not be found in many hardware stores. Hardware stores (True Value, ACE, etc.) carry canning jars. BIGGER hardware stores ike Home Depot and Lowes, do not. Its a matter of popularity too. Most home gardeners may not even bother with trying to be organic when they grow things. Here, I spend extra time and money on organic alternatives to harsh chemicals. Herbs are no different. I wouldn't want to add a chemical base like Miracle Grow to herbs, or spray them with nasty refined chemicals. One place that I DO know that carries MANY organic products is Peaceful Valley and even though they are far away on the west coast, I still buy quite a lot from them. Needless to say , if I could find ALL the organic products in a LOCAL garden shop, I would become their best customer!

We put snow in the pot to keep it from drying out while living in the porch. (We certainly had plenty to spare ...) I'll keep in mind for next year to get it outside before it buds ... We kind-of skipped from three feet of snow on the ground to Summer this year. (Was so glad that I wrapped the bushes in the ground with burlap to protect them.)