Here is what I grow in the 3gallon containers

Spacemaster cucumbers
Marketmore cucumbers
Red Acre cabbage
Jersey Wakefield cabbage

Because the container is smaller, be sure to water often.

You'll need several containers of everything to feed two people. What most packages omit is the amount of horizontal and vertical space that is necessary.

Cabbage 16" wide X 14" tall (not including container)
Cucumber 14" wide X 12" tall

Hope this helps. I just harvested my first Wakefield. The goal was a 2 pound cabbage. Mine was 1lb 9 oz. and it took 160 days from seed to eat.

I would like to know if it's possible to grow root vegetables in 3 gallon containers. As stated previously the containers are cylindrical and the diameter of the rim of each container is 9"-10".

How many carrots could I grow in the type of container I just described? I don't know the depth of the container but I assume that you could grow carrots in this container because you don't need to space them very far apart with plant spacing. My carrots are called little finger, they are a short variety; you only need to thin each 1"-2" apart.
The length of my carrot variety would be 3" x 1" (this is when it's fully matured). The description on the back of the packet says "Ideal variety for container gardening".

How many white radishes could I grow in the type of container I described? Once again with plant spacing once you've thinned the seedlings out, this is a vegetable where
you don't need to space them very far apart; you only need to space each radish you're growing 1" apart.

How many turnips could I grow in the type of container I described? You only need to space each of the seedlings with the variety of turnip I have 4" apart.

Saying that "you would need several containers to grow each vegetable you want to grow". Doesn't really help much.
All I would really like is a recommendation of how many of each type of vegetable I could grow that I listed in the type of container I have; even if it's just a guesstimate that would help tremendously. I am assuming that doing multiple rows in the type of container I have isn't an option, due to the fact that my container is cylindrical in shape, not rectangular.

People have stated that they've grown cabbages and
cucumber plants in 3 gallon containers. How many of each (typically) do you grow in each container (3 cabbage heads,
2 cucumber plants, etc.; what I gave are merely examples).

I am assuming that for a 3 gallon container you only grow one cucumber plant and one head of cabbage. How many heads of romaine lettuce (this is when it's fully mature) and
how many spinach plants could you grow in a three gallon cylindrical container with the diameter of the rim 12"?

>>the diameter of the rim of each container is 9"-10".

You are correct, maybe others just toss-out while planting. It's usually good go calculate how many each container can produce. To figure that out, I draw it out on paper/computer. Draw a line down the diameter of the container. For your bucket, that's 9" If the package says the roots need 1" your first row has:

9 Seeds = 9
6 Next rows on either side of the center = 12
3 On the edge = 6
27 TL MAX (remembering that you'll be able to eat some radishes while thinning them out).

Calculate the rest of your veggies in the same way based on the seed package instructions. Remember that you can't usually plant right on the very edge of the container.

I do 1 cabbage per 3 gallon container, and 2 container cukes per 3 or 5 gallon containers. As posted on another thread, I planted over 200 radishes in a large rectangular skid and they grew in our cooler weather, but failed to produce. Maybe you'll have better luck when the weather gets cooler.

How about posting your yields sometime soon!!!

Okay well unfortunately what you said to determine how many veggies can be grown in each container with your formula,
it doesn't make any sense to me.

I'm really bad with math, and anything numerically/computation oriented is basically clear-as-mud
to me.
The part that is the most confusing is this right here:

9 Seeds = 9
6 Next rows on either side of the center = 12
3 On the edge = 6
27 TL MAX (remembering that you'll be able to eat some radishes while thinning them out).

I thought it wasn't possible to plant multiple rows in a cylindrical container because of the shape.

You said with the container 6 rows on either side of the container is 12", 3 on the edge is 6" and you can have a maximum of 27. This makes no sense to me, and I'm very confused. Could you please elaborate and clarify?

I know it's possible that I've mixed up the plant spacing in inches with how many actual plants I can plant per container. However as said I'm really confused and don't understand what you said.

Thank you very much for trying to help. I really appreciate it. If you could explain more in detail what you just said it would help tremendously. Unfortunately it comes off as kind of vague to me; this isn't your fault, it's cause I'm very bad with anything that involves numbers or math....

vrkelly,
very cool , now thats info I can use... 2 cuke plants in a 5 gal. bucket? Is the yield the same has if they each had their own container? What zone you in?

>> Is the yield the same has if they each had their own container?

Yes. Your mileage may vary. Please post back your results on this thread...Cuke variety, container size, yield.

>>kawaiineko_gardener I'm very confused
Just prepare the bucket with your soil. Plant the first "row" down the middle of the bucket. There's left over space on both sides...now fill those in with shorter rows.

Remember for radishes, your "rows" are going to be a few inches apart, not 36 inches like a garden.

Well I understand the concept now that you've explained it with the rows. You're basically saying two rows on the right and left hand sides down the center and rows on the right and left hand sides on the sides of the container. Is this right?
If not, then please clarify.

Unfortunately what I STILL don't understand is the figures you gave me. I understand that you're suggesting to make two rows in the center and two rows on the sides; one row on the left side, one on the right. What I don't understand
is how far apart to space the "rows" in the center.

Another thing I don't get is the figures you gave. Were you just giving them as examples to try and clarify what your idea was, or was this actual row and plant spacing
for one of the vegetables I gave you.

Here is the row and plant spacing for the veggies I plan to plant (this is directly from the seed packet info on the back of the seed packets I have).

What I REALLY don't get is the figures you gave here:

9 Seeds = 9
6 Next rows on either side of the center = 12
3 On the edge = 6
27 TL MAX (remembering that you'll be able to eat some radishes while thinning them out).

I thought it wasn't possible to plant multiple rows in a cylindrical container because of the shape.

If you could PLEASE give clarification with the figures you gave, I'd appreciate it. I would like to try your idea. Unfortunately parts of it are still confusing me. I can't apply what I don't understand.

I gave the row and plant spacing for my seed varieties as a reference because I didn't know whether or not the numbers you gave were just as a general example or referring to one of the vegetables I want to grow.

Parris Island Cos Lettuce:

Row spacing:18" (1-1/2 ft)
Plant spacing: 12" per plant

Turnips:

row spacing:1-1/2 to 2 ft apart
Plant spacing:4" per plant (this is after the seedlings have been thinned)

Carrots (little finger variety which is a shorter variety than a regular carrot):

Row spacing:I don't know; the seed packet doesn't say
Plant spacing:1"-2" (this is after you've thinned the seedlings out)

spinach:

Row spacing:1-1/2 to 2 ft.
Plant spacing: 6" per plant (this is after the seedlings have been thinned out)

Yes it looks like you understood most of my note. The row spacing gives you enough space to walk down the rows. So skip the row spacing stuff on the package.

Probably the best way to get the row spacing is to search this forum or Google for Square Foot Gardening. Of course the plants would love MORE space if they can get it.