Cabbage, Collards

[hdan]

I'm seeing online shouldn't grow cabbage, collards together. Is this true? It is same plant family. Or is it ok long as planted on opposite ends of raised apart with another crop in between?

Also, did I post correctly this time?

 

[digitS']

I don't fully understand the serious need to separate the two. Let's say that counting both, the gardener has 20 plants. Might there be less risk of pests if 10 are separated by 30 feet from the other 10? I suppose so. Soil nutrient depletion? Yeah, if they are otherwise crowded and it would probably be better to have different species of plants alternating in a bed or in near rows.

That being said, what about the suppression of pests and applying fertilizers in a somewhat cabbage/collard specific way? The gardener's time and efficiency may be enhanced with having the plants in close proximity.

Twenty plants are not like 20 acres of monoculture cropping. In that scenario, it may be that a single issue quickly becomes a 20 acre problem. Presumably, most gardeners will have some measure of diversity within their 1000 square foot garden. This diversity, in and of itself and perhaps of a casual nature, will lessen the crops as targets for pests. It will also allow for better use of nutrients available to the plants if not in a single season but over the seasons of gardening.

Steve