Posted: 15/05/2015 at 10:54
I think there might be more negatives than positives with planting Dahlias near asparagus.
There are certain plants that help asparagus like parsley and basil as it help with plant vigor, and planting tomatoes alongside asparagus helps deter asparagus beetles. (These plants also help one another.)
Other friendly plants to place near asparagus include marigolds (Tagetes), comfrey, coriander and dill. These plants deter some insect pests, such as aphids, spider mites and other harmful species.
Not sure about Dahlias as they offer no benefits and may hinder plant growth and attract harmful insects. I would be very interested to here what others think about this.
Plants to avoid near asparagus include garlic, onions, potatoes and gladiolas . Garlic and onions can inhibit the growth of asparagus and other plants like peas.