Just remember: Most blackberry plants grow to be an average of 4-5 feet tall and wide. RCA Trellis and Thornless Cultivars Patrick Byers Regional Horticulture Specialist MU Extension –Webster County Marshfield, Missouri, USA. The jumbo-sized blackberries are firm and glossy, and as big as a quarter, sometimes larger. 4. They all survived our very mild winter and are nice bushy vines. One of the main reasons simple is better for me is that I have an adult form of Muscular Dystrophy, which gives me muscle weakness. I've done this for a couple years with Triple Crown. I can drive the metal stakes, though it isn't a fast process. I definitely agree with treated 8 ft 4x4's. :-) I agree with everyone else here that the stamped steel posts won't cut it. Sep 17, 2019 - Make room in your yard for Triple Crown Thornless Blackberries and you will have access to some of the most amazing berries around. All that foliage attached to the trellis catches a lot of wind. I live in southwestern Pennsylvania I just prepared two 50' X 3' to plant blackberries in the spring. As long as one wraps the laterals around the wires to keep them off the ground, they don't tip root. Triple Crown Thornless. Strong. 5 Triple Crown Thornless BlackBerry Plants Great Tasting Large Berries Vigorous (Legendary-yes) 02 Triple Crown Thornless BlackBerry Bush Tree - Healthy Tree Grown 4" to 6" Tall. Skip the stamped steel posts, with their little flanges that rust out in a year or two. Triple crown blackberries are only hardy to about -5F. They can get the size of broom handles and are not that flexible. Hi. That bed is about 28' long and 6' - 7' wide. Should we still get some pruning in this fall? Does this make sense? I am sure you are going to try to keep the berries clean either by cultivation or by mulch, which is what I use, so just crosscontinue the method out to the anchor. We cut back all of the floricanes last fall. We let the plants grow all autumn, until they completely grow over the 6-foot trellis and down to the ground on the other side.” ‘Triple Crown’ is a semi-erect, thornless blackberry cultivar. The four wires give me plenty of options on placing the laterals. The big difference is these new canes are about 1/2-1" diameter and self supporting. Also remember on spacing that if you plant 8 ft apart you only leave 4 ft.for each plant to grow outward before they begin to cross each other. 2. Dig a foot from the canes and try to go down at least a foot. $29.99 $ 29. Website: https://farmingseattle.com/ for plants & compost worms in Seattle. Big Daddy Thornless Blackberry. Does this sound about right? Materials and Methods Two thornless blackberry cultivars, Chester Thornless and Triple Crown, were established in 2011 at the Armstrong Memorial Research and Demonstration Farm, Lewis, Iowa, and the Horticulture Research Station, Ames, Iowa. How about hammering down larger wooden stakes right next to the field stakes. I have found that whatever type support you use, after a few yrs. Thanks. 3) I plan to use a simple 2 wire trellis system, using 3 metal stakes (those green stakes you get from Home Depot/Lowes). Given your dimensions and a modest success, you should easily get 100 pounds of berries per season by year 4 or 5. We are left with tons of green growth - canes up to 20 ft long. $58.00 $ 58. If they grow as mine do, they will require heading back several times during the growing season to keep them under some degree of control. The fact that you could weave triple crown canes shows they were not robust at that time--mine are too rigid for that. I like the idea of doing this way because it creates an organized method for removing flouricanes. I have another bed where I want to add Triple Crown (semi erect). Remember that every place there are leaves on a lateral may have a fruiting spur the next year. I've had a bigger problem with the wind wanting to make the trellis lean. My questions are as follows: 1) I plan to make a simple two wire trellis. My berries send out 20 ft. shoots regularly and side shoots almost that long. That would give more growing room and take away some weight bearing from the primary 3 stakes, and would also help from leaning-- at least in one direction. So I would say build your trellis so it's comfortable to you (think here of the picking) and as sturdy has your health permits, and prune accordingly. If you cut the floricanes right after fruiting, there shouldn't be any primocanes tip rooting yet (Triple Crown grows straight up for quite a while.) It's OK to let laterals from adjacent plants overlap. The plant is semi-erect and thornless and bears large, flavorful fruit. Explore. 1) Will the Triple Crown primocanes be strong enough to support themselves until after berrying or even through an entire season? Mine are at 6' spacing b/t plants. 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