Maokai vs Nami

In lane, use your spells: each spell you cast or get hit by lowers the cooldown of Sap Magic (passive), and your next auto heals you.

Throw Sapling Toss (E) into brush: there, the sapling lasts longer, explodes wider and slows more.

Dash to your target with Twisted Advance (W): you're untargetable during the dash, and they're rooted when you arrive.

Cast Nature's Grasp (R) from far away to engage or block a path: the wall moves slowly, and the root lasts longer after a long run.

Change direction when she casts Aqua Prison (Q), then step up if she misses: it's her only stun outside her ult, on a 12 to 8 second cooldown.

Avoid trading when she casts Tidecaller's Blessing (E) on her ally: their next autos and abilities slow you and deal more damage.

Step out to the side of Tidal Wave (R): it travels a long way but moves slowly, and its slow lasts longer the more distance it has covered.

If you can engage, target Nami when she steps up: with no dash or leap, she can only walk away.