Sometimes one wants to encourage rhizomatic behavior. This is possible and rhizohms will thrive when provided care.
But controlling rhizohms is difficult. They resist being shaped or trained.
There is the case when a rhizohm that has been nurtured can grow out of control. As such, an intervention is necessary.
More concerning are unwanted rhizohms. They can be quelled be having expectations that they will be stopped will likely lead to disappointment.
When two or more rhizohms come into contact, there can be competition but this is not an inevitability. Rhizohms can coexist, although competition for resources is inevitable.
A situation of multiple rhizohms calls for supervision and likely intervention.