The Green Team

My garden is a small indoor one
it contains four green  plants
Of which I do not even know the names

Four, it seems,  is sufficient
They have found their own preferred place
And degree of water and light acceptance

I have many times tried to add a fifth
But it does not work
I think the other four team up and reject
My fifth choice

Not that I am scared that
The Supreme Four will one day
Gang up on me
If I dare add a fifth,
But I always keep a small light on at night

One just never knows.