A very important part of companion planting is knowing each plant well enough to make sure that they’ll play well together. For ginger, the best growth scenario is a hot, humid environment, with a rich soil that doesn’t dry out very quickly – but it can’t be soggy. If the soil is too wet, then your ginger becomes at risk for root rot, so you want something well-draining that will retain moisture, just not TOO much. Keep that in mind when you pick its companion and you’ll be well on your way to discover the perks of companion planting!