It certainly will, sounds like a crazy idea to me. Sometimes i get greedy and plant my broccoli too close together, result...smaller heads. For better production i'd space them 400mm apartvat least. If you have the room try planting the 3 together as suggested and compare your bounty.

Dan

Thanks, Dan, I held off, the company had sad you could separate them but it would risk injuring the plants, and that seemed like a red flag, I had never heard of planting veggies like that except for cukes. I will plan ahead and do my own seedlings next year.

Sandy

Sandy,

I know this is an older post, but it isn't crazy, you can do it and it works. I have done this with broccoli in one of my movable high tunnels and had beautiful heads. It is an idea from Eliot Coleman.

Here is clump of 4 broccoli plants.

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Here is the whole movable spot after I moved the building off of it.

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Sorry, I can't find any mature pictures.

Jay

I have a friend that planted cabbage, sprouts and broccoli three and four to a clump. The only thing he did was to space the clumps at a larger distance than he would single plants. Like Jay he had a good crop and less hand weeding was needed. I also have grown onions in clumps of three or four they also grow fine this way. My thanks to Elliot Coleman for that information on planting in a clump.

Curt