Thornless Blackberry Varieties: Erect, Semi-Erect and Primocane
Thorns are the reason most people stop growing blackberries after one season: wild and old-variety canes tear skin, snag clothing, and turn pruning into a chore done in leather gloves. The University of Arkansas program changed that, releasing a run of thornless, erect varieties from the 1980s onward that stand on their own without a trellis, and the USDA's semi-erect types, Triple Crown and Chester, added heavier yields on canes that want a wire to lean on. Nothing here has a thorn, and every one is self-fertile, so a single plant crops.
The 13 varieties sort by chill requirement, 300 to 900 hours, because it decides where each one will fruit: Natchez and the Prime-Ark types get by on a Gulf-coast winter, while Apache and Von want 800 hours or more and sulk south of zone 7. Read the notes column for growth habit. Erect types stand alone, semi-erects need a trellis, and the Prime-Ark line fruits on first-year canes, which means a fall crop on this year's growth and an easy mow-down management in cold winters. Hardiness runs zone 5 across the board; Chester is the safest choice at the northern edge.
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| Variety | Chill hrs | Ripens | Zones | Disease resistance | Notes | Where to buy |
|---|---|---|---|---|---|---|
| Natchez | 200–300 | Early June | 5-9 | moderate; some cane susceptibility | large, mild sweet berries, good fresh — One of the earliest-ripening thornless erect types and low-chill (~300 hrs), so it fruits well in the warm South. | Buy $19.51 |
| Caddo | 400 | Early, a few days after Ponca | 6-9 | excellent plant health | large berries about 8 grams, firm and sweetArkansas 2018 release needing an estimated 400 chill hours (NC State caneberry guide); Osage-like flavor on noticeably bigger berries, with high yields and excellent postharvest handling. Zone span narrowed to 6-9: the chill source states no zones, UMD reports thornless blackberries are hardy into zones 8 to 6 with winter injury likely in 6b and colder, and Caddo's tested hardiness showed very limited injury only to a low near 1F. Not a zone 5 plant. | Browse growers |
| Osage | 350–400 | Early to mid season | 6-9 | good; superior postharvest storage | small to average berries, sweet and low in acidArkansas 2013 thornless erect release needing an estimated 350-400 chill hours (NC State caneberry guide), with good flavor and production and uniform drupelet fill. Zone span narrowed to 6-9: the chill source states no zones, nursery listings claim 5-9, but UMD reports thornless blackberries are hardy into zones 8 to 6 with winter injury likely in 6b and colder, and the UA release recorded little injury only to about -8.6F. Zone 5 growers should expect cane damage. | Browse growers |
| Ponca | 400 | Early, with Natchez | 6-9 | susceptible to cane and leaf rust | medium berries (about 6.8 g), the sweetest of the University of Arkansas releasesArkansas 2019 release needing an estimated 400 chill hours (NC State caneberry guide). Per the University of Arkansas release announcement, first harvest comes with Natchez, two to four days ahead of Caddo and Osage, and the fruit holds up well after picking. Watch it for cane and leaf rust (UMD). Zone span narrowed to 6-9: the chill source states no zones, and UMD reports thornless blackberries are hardy into zones 8 to 6 with winter injury likely in 6b and colder. | Buy $59.99 |
| Prime-Ark Traveler | 300–400 | July floricane crop, then fall on primocanes | 5-8 | good | firm, sweet, ships and holds well — Thornless primocane type bred for shippable firm fruit, giving a dependable late-season second crop. | Browse growers |
| Arapaho | 400–500 | Early-Mid June | 5-9 | good (rust-resistant) | sweet with small seeds — The earliest thornless erect cultivar with notably small seeds (~500 chill hrs), good for short-season and Southern gardens. | Buy $24.99 |
| Chester | 300–500 | August | 5-8 | excellent (cane-blight resistant) | firm, sweet-tart, holds well — The most cold-hardy thornless semi-erect and very productive; late-ripening.Noted for winter HARDINESS rather than a high chill requirement (cited ~300-500 hrs). | Buy $37.80 |
| Ouachita | 400–500 | Late June-July | 5-9 | good (rosette/orange-rust tolerant) | firm, sweet, high-quality berries — A reliable, upright thornless workhorse (~450 chill hrs) with a long harvest and good disease package for most of the country. | Buy from $24.99 |
| Prime-Ark Freedom | 300–500 | June floricane crop, then Aug through frost on primocanes | 5-9 | moderate | large, sweet, good fresh — First thornless primocane-fruiting blackberry, so tipping canes gives a fall crop even in short-season areas. | Buy $16.99 |
| Triple Crown | 400–500 | July-August | 5-9 | good | large, sweet, excellent fresh flavor — High-yielding thornless semi-erect with top-rated flavor; trellis the long, vigorous canes. | Buy $39.00 |
| Von | 800 | Mid to late, over about six weeks | 6-9 | strong resistance to orange rust, fruit anthracnose, and double blossom/rosette | medium to large sweet berries, small seeds, low acidNC State's first thornless release and the best disease package of the bunch; hardy to about -12F and unusually tolerant of wet weather. Its estimated 800 chill hours rule it out in mild-winter regions. Takes two years to reach full yield. | Browse growers |
| Apache | 800–900 | Mid-Late July | 5-9 | good | large, sweet, firm berries — Very large-fruited thornless erect type on strong self-supporting canes; among the highest chill needs of the Arkansas erect series. | Buy $24.99 |
| Twilight | — | Early to mid season | 6-8 | — | very firm berries with thick skin and good flavorSemi-erect thornless type singled out by UMD for storage and shelf life. Chill requirement not published. UMD notes thornless blackberries are typically hardy into zones 8 to 6, with winter injury possible in 6b and colder. | Buy $16.99 |