A reasonable amount. Riesentraube is a huge plant (at least mine was). I would try to make sure the ground is very moist but not wet, use a shovel to dig up the roots, making the circle as wide as the leaves are, make a bigger hole where you want to transplant it, set it in there, then add some potting mix around the root ball. Water lightly, fill the hole with dirt and water again. You'll probably lose all the blooms but don't worry - those plants will produce enough toms to feed a congregation. I had probably 400 ripe toms on the plant at one time last year. They grow like grape clusters, 20-40 toms on a cluster at a time.

PS, do this during the late evening and if an overcast day is forecast for tomorrow, that will also help.

Good luck,

Mike

I'm wondering if Mike misunderstood your situation (or maybe I am). If the plant is now in a container, I'd deep-dig a 2' x 2' space, plant the Riesentraube leaving about 20" or less of the plant above ground. It will develop roots all along the buried 10" and should turn out to be a fine tomato. You have a long season ahead of you. Gary

You can plant it in the ground, but your fruit set will probably be halted/delayed for a little as the plant adjusts to the new conditions.

Riesentraube for me starts out smaller than all the other seedlings and then once in the ground when it starts hitting fruit set, it gets massive, and outgrows a lot of other varieties. Last year was my first time growing it and I'm growing it this year again.

Transplanting from pot/container to ground is not that risky or difficulet.
First, make the hole ready, with good soil mix at the bottom. Also make it bigger than your plant.
Water the container well before taking the plant out.
Kind of wrap the top with a cloth to make the handling easier.
It would be better to have a second person to help you when trying to take it out.
If the container is plastic and not very expensive, you may want to sacrifice it by cutting and removing some part of it.
This way you will just grab the roots with all the soil and drop it in the hole.
Te rest is easy; Fill around the plant and pack reasonably well and water.
You may install stakes for future use.

When reisentraube was little it had the appearance of a dwarf variety. I decided to stick them in some pots in case my new garden had any issues. I usually don't do containers because of the heat although I do have a few 30 gallon containers with squash and beans until I get more garden spots prepared.
I didn't go back to check the varieties to see what reisentraube's growth pattern was. Sounds like I'll be digging three very large holes tomorrow!
Should I leave the blossoms on?