[lottieheaven]

Ive planted a load of leeks and onions ........ what kind of crops can I intercrop with ? I assume that blockings light to the bulbs wont affect the alliums growth wise  as long as the intercrop is not too high ?    would salad stuff be okay ?

[mumofstig]

Onions grow poorly with competition from weeds or plants between them, so I expect the same would apply to leeks as well/

[Hamani]

Yeah, some things arn't bothered by intercropping ... but onions REALLY struggle with any competition.

I would give it a miss for the entire allium family sorry.

- Gary.

[DD.]

Don't forget the weeding issue either.

If you inter-crop, you can't whizz a hoe down the rows!

[Stree]

Peppers, carrots, lettuce, beets and swiss chard all  get along fine with onions, just no kinds of peas or beans.
I have just sown White Lisbon spring onions alongside May Queen early lettuce in a trough in the cold greenhouse.

[al78]

I have heard that inter-planting carrots and onions helps deter the carrot fly.

[DD.]

Many have tried that and many have failed!

[devonbarmygardener]

I have heard that inter-planting carrots and onions helps deter the carrot fly.

I was going to say the exact same thing!
Can't say my crops of either were great that year!

[Salmo]

Do interplanted carrots deter leek moths?

[devonbarmygardener]

Do interplanted carrots deter leek moths?

Probably - it's the smell of the onions that is supposed to put the carrot fly off, and the smell of the carrots that is supposed to deter the onion fly, so I should think so.