铁树开花英文怎么说？

I bought this Rhododendron (actually I forgot it's name already, I guess it's 杜鹃花) two years ago.

 I thought it's the most beautiful flowers in the entire garden center.
It supposed to bloom every spring through early summer.
But I didn't see anything last spring. I thought it's dead.
Two weeks ago I replaced garden soil and watered it every day.
Finally I saw this in the morning.

Like 移花said:   Relationship just like your garden, need to be taken care of.

I understand that, but
I am too simple sometimes naive, unfortunately.

It was a beautiful long weekend,  a guy who have never scored a birdie before was teaching friends how to play golf