Once it starts to produce new canes and leaves, you can cut the branch that connects it to the original plant. Most boysenberry plants do have thorns, but there are some varieties that can be bought thornless. my boysenberry has produced hundreds of flowers but the flowers are not fruiting at all,they just dry up and die,would you please give me some tips as to why and how I could help my plant? Simply train them to grow back down, and then back up again on the same post. In the fall strip all leaves from the new canes and cut to the ground all trellis vines that have produced fruit. i have 2 thornless in a raised bed. I moved last spring, so I’m getting my yard ready to go buy more. They come only as plants, not seeds. Should I shade my plants while the canes are bearing fruit? Just made four batches of jelly today. Since you put the stakes in at the ends of the rows, you don’t have to worry so much about damaging the roots when you do so. BOYSENBERRY Pack of 1. To get the best growth and flavor, make sure your berries get lots of sun... 2. What is the difference between a blackberry and a boysenberry? Also cut any withered or diseased-looking canes. Notes. Mine do very well planted outdoors and then just wound into coils and weighted down, and covered with about 6 inches of dried leaves. Let me know your interest. I should add – I live in southern California probably within 12 miles of Knott’s berry farm where they originated (though I’m growing a thornless variety). Long trailing vines with dusty purple coloured berries are a feature of the delicious Boysenberry (Rubus ursinus x idaeus).Thought to be a hybrid between Thornless Blackberry, American Dewberry, Loganberry and Raspberry, the fruit is aromatic and a little tart to taste. Soil: Well-drained soil They are a bramble bush, so they spread extensively if you let them. This also allows for easier stringing onto your trellis. Bore, grey or recycled water is therefore unsuitable. Tie the plants to these to support them as they grow. Plant winter-spring, add liberal blood and bone. They are healthy in many ways. Boysenberries. Half barrels look good with boysenberries and they are the right size too. They contain fiber, vitamin K, and a modest blend of manganese, iron, calcium, and potassium. wikiHow is where trusted research and expert knowledge come together. Gray patches and dying canes are the best indicator of this problem, and fungicides may help if it’s not too far gone. My thornless berries is trying to turn into berries with thorns. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/2\/26\/Grow-Boysenberries-Step-1-Version-2.jpg\/v4-460px-Grow-Boysenberries-Step-1-Version-2.jpg","bigUrl":"\/images\/thumb\/2\/26\/Grow-Boysenberries-Step-1-Version-2.jpg\/aid1103767-v4-728px-Grow-Boysenberries-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"