I am Full of Holes

I have branches, but no fruit, trunk or leaves. 

What am I?

My body is long. I am very healthy.

You can make juice from me. I wear an orange coat. 

I grow underground.

Who I am?

If 

111 = 13

112 = 24

113 = 35

114 = 46

115 = 57

Then

116 = .....???

What occurs:

Twice in a Week, Once in a Year!

But never in a Day?

People buy me to eat but never eat me.

What I am?