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Prime-Jan® Blackberry

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Bears fruit on first-year canes. This vigorous plant yields bumper crops of large berries that are slightly sweeter than Prime-Jim®, though not as erect in growth. First-year canes begin ripening in July, while second-year canes bear heaviest crops in June. Both continue to fruit until frost. Everbearing primocane. Cold-hardy. Self-pollinating. May be covered by USPP #15,788 or other patents. APF-8 cultivar.

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Since 1816, Stark Bro’s has promised to provide customers with the very best fruit trees and plants. It’s just that simple. If your trees or plants do not survive, please let us know within one year of delivery. We will issue a one-time merchandise credit to your account equaling 125% of the original product purchase price. Read more about our warranty policy.


Bloom Color Pink, White
Fruit Color Black
Fruit Size Medium
Pollination Self-Pollinating
Ripens/Harvest First Year Canes July, Second Year Canes June
Shade/Sun Full Sun
Soil Composition Loamy
Soil Moisture Well Drained
Soil pH Level 6.0 - 6.8
Taste Sweet
Texture Firm
Years to Bear 1 - 2
Zone Range 4 - 8

Zone Compatibility

This Variety's Zone Range 4 - 8
My Hardiness Zone ?
The USDA hardiness zones offer a guide to varieties that will grow well in certain climates. Each zone corresponds to the minimum winter temperatures experienced in a given area. Make sure that your hardiness zone lies within the zone compatability range of this variety before ordering.


This variety is self pollinating.

In many cases, you may still want to plant pollinating partners to increase the size of your crops, but with self-pollinating varieties doing so is optional. You'll get fruit with only one plant!

Tools & Supplies

Having the proper tools and supplies when growing your own can make the difference between a good harvest and a great harvest! Here's a list that our experts recommend for this variety.

Planting & Care

Learn all about how to grow blackberry plants in The Growing Guide. An entire section of our website dedicated to your growing success.


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Questions & Answers

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Browse 4 questions Browse 4 questions and 9 answers
Should I cut down fruit bearing blackberry canes?
Rodney I on Oct 25, 2017
BEST ANSWER: Most people just cut back any dead or diseased canes, then they have two crops per year; one on the old canes, and one on the new canes.
Does this prime jan need to be trellised? Or is it erect enough to stand on its own?
Cathy on Jun 9, 2016
BEST ANSWER: I provided a small 30" tall trellis at the beginning, but the second year the stalke did not need it and it could stand on its own. The trellis still comes in handy for the drip irrigation lines.
When is the best time to transplant?
Joyce D on Jun 21, 2020
BEST ANSWER: We appreciate you reaching out to us. Transplanting is best done when the plant is dormant so either late fall early winter or early spring before the plant wakes up.

If you have any further questions please don't hesitate to reach back out to us. Have a great day!

Customer Reviews

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These plants took of the very first year and even produced a small amount of berries. This is the second year and they have already doubled in size by mid May and can't wait to see how may berries it will produce this year.
May 23, 2016
over 5 years ago
Prime Jan
This is only my 2nd year with these plant,so far all I can say is that they lived and are coming back again.The few berries I had last year were very tastey.
May 10, 2016
over 6 years ago