Triple Crown Thornless Blackberry Plant

Thank you for your question! Our Jumbo Cell Pack plants will be shipped at 4-6" tall, while the gallon-size container plants will be approximately 12" tall.

This variety sends out lateral branches along the ground. They should be pruned back to 12 inches and they will then run and produce new growth. All varieties of blackberries should be trained to a fence or posts with plenty of air within the leaves. By pruning the laterals to 12 inches you will have a better harvest. Let me explain a bit more. The laterals to be pruned to 12 inches should be the first year. If you have second year vines 4 feet or longer you need to stake these or train to a fence. I use plant Velcro ties to do this. Do not prune huge lengths off your second year vines or you will end up with less harvest. Triple Crown Thornless will stay at ground level, creep and start new rooted shoots if not trained to be upright. Some plants can get as long as 16 feet so you need a lot of space to grow the lateral branches at ground level.

All my blackberries are in 27 gal containers. (I made 27 gal totes into self watering containers with help from online tutorials.) Use a good quality liquid fertilizer every week after they are established. They drink a lot of water.
I tried smaller containers at first - 5 gal buckets and 18 gal totes. The berries quickly outgrew the 5 gal buckets and never did all that well in the 18 gal totes. Now they are doing great, though not quite as well as those in the ground. You will need bird-netting to keep them from eating all your fruit.

You mentioned, "The canes are long, strongly, and a nice color with full, dark green leaves coming out at the ends." This variety is an aggressive grower, and will produce canes several feet long if allowed. For the best quality and fruit production, I have found that after the first year of new growth if I top the canes at 4 feet high in the fall, and prune back the lateral shoots to about 18", come spring they will be loaded with berries. I believe you will get better results if you reign them in a bit. Or, you can let the side shoots grow all summer and cover with dirt every few feet and over-winter them. By spring, the dirt covered spots will have developed roots which you can cut away from the main stem and multiply your blackberry plants! Best of both worlds. Don't be afraid to reign them in with some aggressive pruning.

We appreciate you reaching out to us. That is a term we use to reference our packaging. Our cell packs come in a package of 3 or 6 plants.

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

You have to make sure they have plenty of water , especially once they start blooming. I have drip tubing on mine and my berries turned out fine.

Hi Gerald, blackberries thrive in full sun but will grow and set fruit in partial shade. To the best of my knowledge, they will still need at least 4 hours.

We recommend a pot that is 24" to 36" across or even a half whiskey barrel for these plants.

Yes the only planting rule pertains to black raspberries. Do not plant Red, Gold or Purple raspberries within 75-100 feet of Black raspberries. Black raspberries may be more susceptible to viral diseases carried by aphids to and from nearby raspberry plants.

The largest container we offer is the small 1 gallon pot.