Time, water, Sun light M-gro keep in vegetated state until roots spread out feed plants every month they pick up growth Blackberry plants re heavy feeder, but can burn up it show in top plants first new growth. your plants as small they are I add tablespoon 12" off plant 2 sides every month.They begin to grow at any point 4" a day. April late planting time takes six weeks roots to begin growing. New canes come up next year like wow over winter they have crown just under soil new canes grow up to foot aday for few days. Be-careful with fertilizer on young plants.

I won't attempt to answer all of your questions. These types of fruit are collectively refered to as brambles. Brambles are much easier to grow in the ground than in pots, and are much more productive that way. If they are growing in the ground it should be relatively easy to take some to transplant, or propagate them when it comes time to move. Especially so if you have a time-table for the move. Blackberries and raspberries have two basic types. Primocane (sometimes called fall or everbearing) and floricane types. Primocane types grow the fruit on canes the same year that those canes emerge from the ground. If allowed to overwinter, they can bear a second, smaller crop the next year. Floricane types don't fruit until the year after they emerge from the ground (they have to experience one winter before they fruit). Nearly all blackberries and black raspberries (certainly all thornless ones) are floricane varieties. Rasberries are common in both types, although I don't know which types the thornless ones come in. Raspberry "thorns" are generally more of a fuzz and are not dangerous. Blackberries and black raspberries can be vicious blood-drawers. Raspberries and blackberries have a very different taste and character. Everyone has their preference. How would you answer a question "Does apple taste better than pear?" The blackberries seem to have much greater variation in flavor amongst varieties than do raspberries. I grow 4 varieties of primocane red raspberry, 1 variety of black raspberry, and 5 varieties of blackberries (all thornless). It would be hard for me to pick one type if I had to. If I had to lose one it would probably be the black raspberries because of the thorns. If I had to pick one for you, from what you described, I would probably go with blackberries planted in the ground. They will be the most productive, are easier to keep from spreading, and can be thornless. Understand that you won't get any fruit the year you plant them and probably not much the following year either. The reason fresh berries are so expensive is because they are perishable, fragile, and labor-intensive to pick. That makes them great candidates for growing at home.

This was my second year with my TC plants growing in their new digs, like yours, in containers. I don't know what kind of plants you started with, but two of mine were rooted tips from the original plant I bought and that plant originally had only one short and narrow (less than a pencil) cane. Each plant sent up at least one thick cane during the first real growing season (I think the original mother plant maybe had two). From those three plants I harvested a gallon-sized plastic bag (freezer). Like you, I thought that was pretty good (and about the same as my boysenberries also in containers). Going into Fall I have cut off all but the four strongest new canes on each plant. Considering the vigor of both kinds of berries I think that 4 canes is about as much as you can ask from containers. Those canes have been tipped at about 5 feet and I'll let any laterals that develop grow until the dormant season and then cut them back to about a foot. My berries grow in tall cages (rectangular prisms), with one cane tied to each vertical edge. I feed weekly during the growing season with a liquid hydroponic mixture that I copied from some university site describing greenhouse production of containerized raspberries.

Usually blackberries are sweeter when they get more sun. Also berry plants that are only a year old do not produce as good tasting fruit, it will probably taste better in another year or two.