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Shallot Companion Planting
Allium cepa var. aggregatum
Allium (Amaryllidaceae) -- cool season
1 beneficial companion
1 antagonistic relationship
Good Companions for Shallot
CarrotDaucus carota subsp. sativus
BeneficialPest SuppressionDocumented
Shallot volatiles (same dipropyl disulfide compounds as onion) mask carrot host-plant odors from carrot fly. Same mechanism as the well-documented carrot-onion intercropping.
Shallots function identically to onions for carrot fly suppression. Interplant in alternating rows.
Sources
- Effect of intercropping with onion on the behaviour of the carrot fly Psila rosae -- Entomologia Experimentalis et Applicata (1984)
Crops to Avoid Near Shallot
Bush BeanPhaseolus vulgaris
AntagonisticAllelopathyDocumented
Shallot root exudates contain the same thiosulfinates as other alliums that suppress Rhizobium nitrogen-fixing bacteria in legume roots.
Same allium-legume antagonism applies to shallots. Keep separated from all legumes.
Sources
- Allelopathic effects of Allium species on legume Rhizobium symbiosis -- Plant and Soil (1996)