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Early and heavy producer. Erect canes make it easy to pick these firm, midnight-black berries. Fruit stores well for longer-term enjoyment. Plants are disease-resistant and cold-hardy. First-year canes begin ripening in mid-July, while second-year canes bear heaviest crops in June. Both continue to fruit until frost. Everbearing primocane. Early season. Self-pollinating. May be covered by USPP #22449 or other patents. APF-45 cultivar.


Bloom Color Pink, White
Fruit Color Black
Fruit Size Medium - Large
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 Very Sweet, Juicy, Excellent
Texture Firm
Years to Bear 1 - 2
Zone Range 5 - 8

Zone Compatibility

This Variety's Zone Range 5 - 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.

Size & Spacing

Mature Size

When your plant matures, it will be approximately 4 - 5' tall x 3 - 4' wide.

Recommended Spacing

We recommend spacing these plants 3 - 4' apart to ensure room for growth.


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!

Related Assortments

This item is also available in this money saving assortment.

We bundle many of our popular products in assortments with other items that compliment each other. Plus, when you purchase an assortment, you save money compared to buying each item individually!

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.

Shipping Information

Estimated Delivery Date

You don't pay until it ships.

We work hard to make sure that your order arrives at the ideal time for planting in your location. That's why we only ship living products during certain times of the year. Order now and your credit card won't be charged until your climate is suitable for planting success and your order is shipped.

Our Promise of Satisfaction

1 Year Warranty

Every order comes with our promise of satisfaction. If you aren't completely satisfied with your order, let us know within one year for a free one-time replacement or refund.


We've 'tagged' this item with specific keywords that help you find other products that share features or characteristics with this one. Select a tag below to view all the items that have that particular trait.

Questions & Answers

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Browse 17 questions Browse 17 questions and 55 answers
Why did you choose this?
Stark Bro's Store
Everbearing, self-pollenating, firm fruit
Cheryl F on Aug 3, 2019
Well recommended for my area by fellow gardeners
Charla E on Feb 24, 2019
Everbearing, self-pollenating, firm fruit
Cheryl F on Aug 3, 2019
Cold hardy and two harvests.
Bonnie T on May 20, 2019
Well recommended for my area by fellow gardeners
Charla E on Feb 24, 2019
Wanted a thornless erect blackberry.
Charles R on Sep 22, 2018
A very good choice for my growing zone.
Susan M on Jun 23, 2018
Primocane production, statements that it is very prolific compared to the other Arks, and I wanted something with thorns for a partial living fence and to dissuade rabbits from destroying another plant.
Newbie24 on Mar 10, 2018
Thought it would grow well in my area (it does), be trouble-free (it is, but critters love the vine and the fruit), and produce excellent fruit (it does).
Joan D on Jan 29, 2018
I wanted to get a primocane variety to get more fruit
Meghan L. on May 31, 2016
I was told they are very good producing a lot of fruit, and great flavor, and nice size fruit." Super sweet" "Great Tasting" said my neighbor.
James H on May 13, 2016
Early fruit production
Paul B on May 10, 2016
Going to combined with Chester and see how the patch will do.
Eric and Olivia B on May 4, 2016
Want to try the primo cane variety.
Jacqueline L S on Apr 26, 2016
works for my area, good fruit, but mainly because they have thorns to offer some deer resistance
Les M on Mar 19, 2016
Outstanding plants!! Bore fruit in very neglectful circumstances!!
Deborah S on Mar 18, 2016
Because of its size and it's self pollinating
Beekeeper on Mar 17, 2016
Want to replace thornless blackberry plants that are too tender for my local climate
Jim I on Mar 15, 2016
Ease of care, primocane
Natalie P on Mar 7, 2016
Fruits till frost and cold hardy.
Rick S on Mar 6, 2016
Primocane and zone character
Jon H on Mar 5, 2016
I want higher production by having the berries grow on both new and old canes
Carolyn S on Feb 29, 2016
Cold hardy and two harvests.
Bonnie T on May 20, 2019
Wanted a thornless erect blackberry.
Charles R on Sep 22, 2018
I am interested in the blackberry plants. The spot I want to plant them is near the spot I am planting my apple trees. My question is how close to my apple trees can I plant the blackberries and other plants?
g3n3fi on Mar 25, 2016
BEST ANSWER: I would have to agree that berries and apples can grow near each other. I had boysenberries growing under a Gordon apple in Redondo Beach. Both did great even with mild beach weather. Kids loved picking the berries.
Is this thornless?
Connie C on Mar 13, 2016
BEST ANSWER: The PrimeArk 45 blackberry plant is not thornless, it's a thorny variety.
When and how should I prepare my prime-ark 45 berries for winter?
Lincoln M on Aug 1, 2016
BEST ANSWER: Hello, Lincoln. I have primo-cane raspberries as well as the Prime Ark blackberries and I do the the same thing for both. They are on their own for the winter. In early spring I cut down last year's canes. While this limits me to the main crop in the fall it also avoids a lot of bug/disease problems. I think it makes for a more vigorous primo-cane as the roots don't also have to support last year's canes.
I thought with primocanes you cut them down to the ground each winter, but these indicate the second year canes bear more fruit. Do you just leave canes on and never cut?
Joe k on May 5, 2016
BEST ANSWER: I cut canes that have borne for two years. It's not always easy to tell and sometimes I find a cane that hasn't bloomed part way through the season and cut it then. So the pruning is a bit more continuous during the season. So far ours are young, small, and we don't have many plants so it hasn't been hard to figure out.
Do these need to be isolated from wild or other blackberries? Can they cross pollinate and cause the berries to not be true to parent plant?
Ma Kettle on Mar 22, 2016
BEST ANSWER: No isolation is needed unless you know your wild blackberries have disease issues. The hybridity happens in the seeds. You'd have to plant the seeds from the blackberries, which would grow into new plants whose future berries would be hybrids of the wild blackberries and the Prime-Ark 45 blackberries. It does not happen in the immediate fruit.
Prima Ark 45. Do I need to plant these among other berries for cross-fertilization? I have a raised bed 4' x 4'
George on Feb 28, 2016
BEST ANSWER: I have planted this without any other variety and they are doing great. As far I know these are self pollinating. However cross pollination is always better.
When should I prune my Prime Ark 45 blackberries? I???m in zone 5A.
Michelle W on May 6, 2018
BEST ANSWER: I am in zone 7B, and pruned my bushes in mid-April with great results. You could probably prune your bushes now, in May with good results. I would do it before they enter their growth phase.
Does this plant have thorns?
Linda A on Nov 11, 2017
BEST ANSWER: Yes, the PrimeArk 45 blackberry plants do have thorns.
i have had my plants for 2 years , do i cut them down to the crown while it is still summer or do i wait till first freeze,or when ?
CHRIS S on Aug 4, 2016
BEST ANSWER: wait until frist freeze or dormancy. you still might get some this year. stake them up or fence ti keep them from spreading on the ground. just i ike wild berries they will take over if you dont trim them back. but only the suckers. you should still maybe get a few this year. make wonderful jam and smoothies, enjoy mc
What is a cell pack vs. Small starck container for the raspberry bushes?
Faith P on May 27, 2019
BEST ANSWER: A Jumbo Cell Pack is a bigger version of the divided 6-packs in which you might have bought annuals or vegetable plants in at a garden center. These one-year-old plants are new starts - about 4-6" tall - and will grow rapidly during the next growing season.

The 1-gallon plant is in a #1 trade gallon pot (about 2/3 of a standard gallon) and is two years old, and has an an advanced root system. These plants are two years old and about a foot tall at shipping.
are these bare-root plants or can we get potted berries?
Richard O on Feb 25, 2019
BEST ANSWER: These are not bare-root; we have varying sizes of potted berries. Please see the "Choose an option" dropdown menu near the top of the page, which will show you the various sizes/options that are available.
I planted three of these about six weeks ago. They are small seedlings. What should I be doing to ensure they make it through the winter?
UticaThom on Sep 25, 2018
BEST ANSWER: Around the end of November, cover the ground around the plants with straw or wood chips to protect them. In late winter/early spring, peek under the straw and if you see new growth, remove about half of the mulch. The plants will grow up through the mulch and you'll already have a built-in weed barrier for the summer.
How many plants are included?
Chris on Aug 2, 2018
BEST ANSWER: That will depend upon which option you choose. Please see the "Choose an option" dropdown menu near the top of the page, which will show you the various sizes/options that are available.
How deep do the roots go on these plants?
Dorothy L on Oct 23, 2017
BEST ANSWER: That will depend entirely upon the tilth and loaminess of your soil, but most blackberries tend to be somewhat shallow-rooted, about a foot deep.
I have a West facing area that I am hoping to plant this in. Will that be enough sunlight? Essentially from noon-sunset in zone 5A.
Courtney H on Apr 9, 2017
BEST ANSWER: Yes, that should give you a nice crop after a year or two. Nutrients and soil conditions will also have a profound effect on production; make sure those elements have been addressed. We have a special blackberry fertilizer that is precisely formulated to give those plants exactly what they need: // It contains many micronutrients not found in all-purpose garden fertilizers.
josie on Feb 13, 2017
BEST ANSWER: This Prime-Ark variety is not thornless, but this one is: //

Customer Reviews

4.1 / 5.0
42 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
PrimeArk 45 Great plants.
I got my PrimeArk 45 plants and had great success with my first year planting.
I was amazed at how fast they grew. I pinched the tops and made them branch out and got a quite a few quarts on my 3 plants. I was very pleased with them.
February 19, 2016
over 3 years ago
Primeark 45 Primocane Blackberry
We love our Primeark 45 blackberrys. We have ordered several different times and our family is very pleased with this berry. When we received our shipments from Starks the berry plants had to be repotted in larger containers to grow to a plant size that could be planted in or berry patch. The first primocanes began to grow in early April,I topped the canes when they were about four feet high. I had 10 berry plants that were producing over five gallons of berries per picking. The berries are large and very sweet when fully ripened.
May 24, 2016
over 4 years ago
PrimeArk 45
Good producer in the first year of planting. Fruit is large, plentiful, and exceedingly sweet. Plant is hardy and had no trouble with a harsh Ohio winter.
May 1, 2016
PrimeArk 45 Primocane Blackberry
Outstanding variety for home use — began bearing in late May and continued into October, with peak in midsummer. With just four plants (a couple didn't make it) we picked about a pint every day in peak season and handfuls throughout the season. The berries were large and succulent. Because we had so few plants, we never harvested large quantities at one, but by summer's end we had several gallons in the freezer to a big jelly-making day. I've tried several varieties. This is the best yet. Absolutely recommend them.
Jim Hamilton
Buffalo, MO
November 20, 2016
over 4 years ago
abundant crops for 2 years.
I have been able to put up gallons of blackberries and enjoy the thorn less bushes. The cane variety is great in that it creates its own support system. I have frozen so many blackberries, made 4 blackberry cobblers, and have been able to give some to friends. I have also shared the offshoots to friends to start their own blackberry vines.
Berries are large and sweet. I do have to fight the birds for them though.
August 16, 2016
over 4 years ago
Happy customer
I am in zone 7 and the plants have done well in my area. I had some fungal problems but pruned the lower branches and disposed of the infected leaves. To much Moisture I think. Overall I have been pleased with my purchase.
May 10, 2016
over 4 years ago
So far so good
Entering it's second growing season, already showing lots of buds... excited to get a good crop this summer! I've grown other blackberries before, and this one has not produced suckers like my other ones did... but I had to move it this spring. Survived the transplant and still getting ready to bud out for berries.
May 11, 2016
over 4 years ago
plants are thriving!
I planted 6 of these plants three years ago and they are growing like weeds. We had a good berry crop the second year and the blooms are popping going into the third spring. The berries were a touch more tart than I would of liked but I am very pleased with these plants.
May 9, 2016
over 5 years ago
have had two procane blackberry for 2 yrs-first year we had 4 large berries-excellent texture, taste, and moisture-surprised they survived over the winter-have not had any flowers this year- in part because of rabbits and early weather-they are maturing so expect the best
August 13, 2016
over 4 years ago
Not for Alaska
They produced a few berries last year when I ordered them but did not come back this year. We are supposed to be zone four but it can be iffy. We did not have very much snow cover
May 14, 2016
over 4 years ago