Companion planting for potatoes

Has anyone tried companion planting onions or garlic either before or with the potatoes?  I am wondering is their natural antifungal properties could reduce the pathogen load in the soi.

This sounds like a really interesting idea Casie. Did you ever have a go at it? I think it would maybe need to be a previous crop, since onions and garlic like sunshine, so may be swamped by potato foliage?

I feel this would be a challenge and I also wonder if Casie tried this.

I like the suggestion that Nancy brought up about the importance of sunlight.

Here is an article from the Spruce that answers this question.

When planning your garden, potatoes offer a unique challenge because there are many plants that grow well in close proximity to potatoes, but there are also certain plants you should avoid planting near them.

Here's a list of the best potato companion plants:

   Alyssum
   Basil
   Beans
   Cabbage
   Catnip
   Chamomile
   Coriander
   Corn
   Horseradish
   Lettuce
   Marigolds
   Nasturtium
   Parsley
   Peas
   Petunias
   Radishes
   Scallions
   Spinach
   Tansy
   Thyme
   Yarrow

Lettuce, spinach, scallions, and radishes are shallow-rooted veggies that are a good choice for occupying the spaces between potato plants. Because potatoes are harvested late in the season, the best choices for planting around the potato hills will be early-season vegetables that will be harvested well before you need to stomp around the garden to dig up the potatoes.

https://www.thespruce.com/companion-plants-for-potatoes-2540039

The weed Henbit grows wild in my area, and is said to deter Colorado Potato Beetle. The one time I had it volunteer as a ground cover in my potatoes, I did not have the beetles. So, preliminary trials are positive....

Thespruce.Com has a cross reference for companion planting that is fairly good!

I plan to try planting my cabbage with the potatoes this year. I heard that they each act as a pest deterrent for the other.
Rule of thumb for us has always been to not plant root crop with or following root crop. Garlic is difficult to use as a companion plant because of the timing and garlic hates competition from any plant. I've only had luck using elephant garlic in the flower bed to deter deer from munching the daylilies (aka deer candy) but I have to keep it far away from the iris which could transmit a virus as it did to some overwintering onions I planted once.  I try to keep all the allium family in the same field so in the fall we leave a space, after planting the garlic. In the spring I use the space to plant the onions, shallots and leeks. By the time the porcelain bulbs are ready to be removed, the last of the onions are done. We follow with broccoli, kale, collards, kohlrabi starts as each section of garlic is removed. Timing the brassicas for late season helps deter cabbage moth damage as well.