Triple Crown Blackberry (Rubus 'Triple Crown') is a thornless blackberry selected for heavy crops of large, flavorful berries and manageable canes when trained. You can grow it as a free-standing plant with support, but it performs best on a simple trellis or wire system that keeps fruiting canes off the ground and makes picking easier. Expect a mature height in the 36-60 inch range (with canes that can be guided and tied) and a generous footprint as it fills in over time.
Plant your blackberry where it can get full sun for best fruiting, though it will tolerate part shade. Choose a site with well-drained soil and consistent moisture, especially during the first season and while fruit is forming. Apply a layer of mulch to even out soil temperature and reduce moisture loss, keeping mulch a few inches away from the crown. Provide a sturdy support, then tie and fan canes for good air flow and easier access.
For pruning, remove old fruiting canes after harvest, and keep a manageable number of strong new canes to carry next year's crop. Tip-pruning or training can help keep the row at a comfortable height. Water deeply during dry spells, and feed lightly in spring if growth is weak. With good sun, spacing, and support, you will get cleaner fruit, fewer tangles, and a longer, easier picking window.
Harvest when berries turn fully black and slip from the stem with a gentle pull. Pick every few days during peak season. Triple Crown is self-fruitful, so you can plant one and still harvest, but a second plant can improve overall yield in many gardens. Protect ripening fruit from birds with netting if needed, and keep the patch tidy to reduce pest and disease pressure.