One can isolate fire by puting flowers around it or near it if one does not wish it to go in that direction. Grass and leaves burn, shouldn't flowers?
EDIT: Can confirm what Alex Collins said in the latest version, dead bushes and saplings (that can be used as fuel in the furnace) alongside flowers do not burn. It is impossible to create forest fires because of this. Sure some trees will burn but no one is in any real danger. Don't know if this is intentional or not.
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Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
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Included it in MC-3263.
For that matter, saplings (despite usable as fuel) and even dead bushes aren't flammable, so I guess confirmed, but it's probably intentional.