Zyra doesnt have very high mobility/sustain. You should ALWAYS
keep Pots on you for the laning phase, enough pots can send you to lane and grab 2 kills on your opponent before going back to platform.

When ganked, if you have no way out, and you are level 6, DONT RUN, fight. I promise you, if all your spells go off, and you have ignite, you WILL get a kill. (this rule of corse only applying to when your too far pushed, or dont have flash, and bad positioned.)

Allways remember to take advantage of your cc and aoe damage. Zyra has 3 disables if you count her close-ranged plants. Her ult, when paried with certain others, can be a long ranged, higher damaged, amumu's ult, and we ALL know how often he is banned. Also remmeber to hit as many poeple as you can with your spells, to ensure maximum damage and disable. ALSO dont forget, when your targeted to pop your embrace or hourglass, it can make or break any team fight.

Pros/Cons

Pros

Zyra Has amazing cc/damage/and with this build will be hard to target

Cons

I can't think of any

I recommend this skill order when trying to burst somone (or multipul people) to death-

Cast "grasping roots" to keep poeple in place for other abilities.

Then, cast (as fast as your fingers can press) "rampant growth" as many times as you can directly on top of them.

Continue with a "deadly bloom"

Then most importantly, "stranglethorn" and "ignite"

After Alquiring Tear of the Godess, Use spells as often as possible to create pressure and easy farming, if your too pushedm simply walk back to your tower and take wraiths over walls, oppening with rampant growth(x2) and trying to hit as many wraiths as you can with the rest of your abilitys. (besides your ult of corse)