zyra lacks of jungle sustain until she reaches lvl 3. From now on you gotta be fine. With skilling Rampant Growth, she can kill a camp without getting many hits at all. since zyras plants can tank 4 hits of a jungle creep (2 by drake), she can clear fast and does not have to recall every 3 minutes.

Pros:fast camp clearing
unexpected jungle potential
high damage at ganks in early
good jungle control through Rampants
endless fun

Cons: easy to counter jungle, level 1-3 is hard, sensitive to assasins while CD, your team will flame u

get a good pull at level one. starting with another spell than q will destroy ur total game. dont even think about counterjungling