Ed, When dormant they are good down to probably 10 degrees anyway. On occasion here in Florida it gets to the lower 20's and I have never had any damage to them from it. Granted that is several hours at that temperature and they are dormant now week after week of cold not sure what their damage point would be.

My current berries 3 yr olds, potted year one (wanted to get 9 more varieties potted but time is running out this year): Blueberries - Southern Highbush** ripen chill notes ALICE BLUE** early low chill BECKYBLUE ** early-mid 300 tasty Biloxi year round Brightwell** mid-season 300 fast growing, 12 ft.,sf, tasty Cape Fear early mid-season 300 hot summer, 6ft, large, sf Emerald very early 200 zone 10, PP#12165, very low chill, extended harvest,huge,productive Georgia Gem mid-season 200 hot summer, 6 ft., sf Gulf Coast very early low chill hot summer, 6 ft., zone 10 Misty early-mid 150 6 ft, evergreen, hot summer, zone 10, large O'Neal early 200 hot summer, sf, 6 ft. Pink Lemonade mid-late 200 pink fruit, Northern HB x rabbiteye but OK for here PowderBlue** late season 200 fast growing, keeper, productive Princess early 300 fast growing, aka Primadonna Sharpblue year round Springhigh early 200 PP#16404, large, juicy Sweetcrisp early-mid 200 PP#12165, to die for, holds well, zone 10, 6 ft., heat stress, low production Sunshine Blue** early-mid 150 evergreen, 4ft., pink blossum, sf, zone 10, 5 wk harvest, tasty TifBlue** late season 200 dwarf ** = rabbiteyes

These are the varieties that I have growing: Reka Rubel Tifblue (rabbiteye) Powederblue (rabbiteye) KaBluey Pink Lemonade Sweetcrisp (SHB) Patriot Blue Crop Toro Bonus Bluray Actually. most of them taste about the same. The best tasting is probably KaBluey and Patriot. KaBluey and Pink Lemonade have been the best growers although I just figured out how to get blueberries to actually grow correctly this last year. They were both planted in 2013 and now are 5-6 feet tall and growing well. The rabbiteye varieties do have a noticeable gritty texture, which isn't awesome but on the plus side is that they tend to fruit late in the year. Tifblue took -7F last year and still produced a small crop, which was surprising.

We have pretty good native soil. But not for blueberries. PH is 6.5 (perfect for most plants). About 15 inches of a good clay loam, below that is 12 inches of pure clay. Below that is a sandy-clay mix. I know from digging 4 feet down to put posts in. The raised beds for the blueberries have pine bark fines and peat moss, and a very small amount of garden soil, bagged garden soil.. I add pine bark and a peat based compost yearly. Cover with pine straw. Sulfur was also added. In my pots I use pine bark, peat and diatomaceous earth about the size of regular perlite, sulfur, and other amendments mentioned. I collect rainwater and since the air is now pretty clean even in the Detroit area, the PH of the rainwater is 7.0. I use it straight, or add sulfuric acid until PH of water is 5.0. I ran out of acid, and will be buying more soon. So for now just straight rainwater. I store enough rain water for indoor plants in the garage over winter. About 100 gallons. In the spring and again in mid-summer I add an acidic organic fertilizer, like Holly-Tone, Cottonseed meal, or Micro-life acidic fertilizer. On the first of April and until August, once a month I fertilize with Ammonium sulfate. With all these amendments, and such, PH of soil is about 4.8-5.5. When it deviates I amend to correct using sulfuric acid Doing this for 2 years has kept PH steady. I did have to amend in the spring only. I noticed over winter it tends to slowly rise, so in the spring all water is at 5.0 or even lower to get to ideal PH. Here is a photo of Chandler from this summer Some berries on Toro Here is a different view of my raised beds. the other beds have peat and purchased bagged garden soil. i also recycle old potting soil into them in the spring and add manure compost every fall or spring. Organic fertilizer, mineral supplements, and covered with leaves in the fall. I use the leaves now as a mulch, or pine needles if I run out of leaves. Leaves are shredded. The back row is raspberrries. the middle is peppers and blueberries. The right is tomatoes this year, Crops are rotated, watermelons, melons, beans, etc. The bed against the shed is pole beans this year. next year peppers and garlic. I planted the garlic already. Peppers and tomatoes are grown from seed indoors. The melons too, and onions also.