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 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.

125% Survival Guarantee!

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 - 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!

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

Arrives when it's time to plant

Your success is our priority. We work hard to make sure that your order arrives at the ideal time for planting in your location based on your local climate conditions.


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

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 24 questions Browse 24 questions and 80 answers
Why did you choose this?
Stark Bro's Store
charles j on May 17, 2021
It is a primocane
Mark F on Mar 27, 2021
charles j on May 17, 2021
I needed thorn blackberry bushes as the thornless ones planted before were destroyed by deer. I was advised by locals that deer don't like the thorns and leave them alone.
John B on Apr 1, 2021
It is a primocane
Mark F on Mar 27, 2021
To replace some that we lost.
Robert Y on Mar 22, 2021
Jill B on Mar 16, 2021
honey bee garden
Jocelyn H on Jan 17, 2021
Experimental on south-facing tree line that's recently (last season) been goat cleared of volunteer brambles.
Christine B on May 12, 2020
Had this years ago and it was good.
Jonathan O on May 11, 2020
Because I have a green house and will grow this variety inside it
Erik W on Apr 19, 2020
2 harvests
anna p on Mar 30, 2020
Thorns included to discourage critters
John P on Mar 29, 2020
It will blend in with the natural landscape.
Timothy L on Mar 20, 2020
I ruined all of my wild blackberry patches while clearing land for pasture, how am I to make blackberry wine with no blackberries? Looking forward to trying these when they produce.
NATHAN M on Mar 18, 2020
I liked the idea of two harvests and also that they don't need to be trellised.
Amy R on Nov 16, 2019
looked at several reviews - worth the risk shall review after spring
Linda D on Oct 7, 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
BlackBeekeeper 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
I needed thorn blackberry bushes as the thornless ones planted before were destroyed by deer. I was advised by locals that deer don't like the thorns and leave them alone.
John B on Apr 1, 2021
To replace some that we lost.
Robert Y on Mar 22, 2021
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: Same as Fred, I have blackberries and blueberries near my apple trees and have no problem with either. My apples are dwarf so they throw a little shade in the morning but the rest of the day the berries get plenty of light.
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 should I plant blackberry plants? I live in zone 7b?
Kinseh B on Dec 12, 2019
BEST ANSWER: As soon as you receive them, plant them! The plants don???t do well in the small containers they are shipped in. The sooner you get them in the ground, the better, more productive they will be
just planted my prime-ark 45 black berry do i need to prune it again latter or wait till next year?
ricky b on Jun 30, 2020
BEST ANSWER: We appreciate you reaching out to us. First-year or juvenile canes of erect and semi-erect varieties may be trailing. Let them grow, and they will produce fruit the next year. After the fruit is harvested, prune the canes back to the ground to make room for strong, erect, new canes.

If you have any further questions please don't hesitate to reach back out to us. Have a great day!
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.
I want to double duty these blackberry plants as a privacy hedge. How full do these plants get?
Kody H on May 4, 2020
BEST ANSWER: They are not very dense but no one would dare walk through it. They have thorns everywhere.
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
Can these be shipped to Texas?
anna p on Jun 16, 2020
BEST ANSWER: We appreciate you reaching out to us. Yes we should be able to ship these to Texas.

If you have any further questions please don't hesitate to reach back out to us. Have a great day!
Our Primeark 45 plant came with 6 berries on it. 3 have ripened and we tasted them. each one has been extremely seedy. Large hard seeds inside. Does this variety always have such seediness?
KATHY S on May 9, 2020
BEST ANSWER: Our prime ark plants are well established now, and require a lot of early morning watering. No, we haven't encountered the seed issue you are experiencing. I wouldn't make any snap judgements based on berries that arrived on the plant from the nursery. I would establish them in well drained mulched soil and water them. You will get a huge bumper crop of berries like we did and they are sweet and not crunchy!
Why did I not receive the $15 off?
Trisha on Nov 3, 2019
BEST ANSWER: Hi Patricia - I'm very sorry to learn that you did not receive a discount on your order. Please reach out to customer support to discuss your order details. They can be reached by emailing and by calling 800.325.4180. If you have any further questions regarding this product please don't hesitate to reach back out to us. Have a great day!
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?
Janice 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: //
I also have triple crown blackberries. Would I see a boost in production from planting this variety or are they not quite compatible in that way?
Kody H on May 4, 2020

Customer Reviews

4.2 / 5.0
43 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 5 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 6 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 6 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 6 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 6 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 6 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 7 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 6 years ago
Decent Blackberry
First year blackberries were few, but good. It is very thorny.
May 18, 2016
over 6 years ago