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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For that matter, saplings (despite usable as fuel) and even dead bushes aren't flammable, so I guess confirmed, but it's probably intentional.
kumasasa
Confirmed. Unknown if intended or not.
Ezekiel
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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flowers do burn now, so this bug is 1/3 fixed
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Sapling don't burn in 14w27b!
galaxy_2alex
Sapling do not burn anymore.
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Confirmed for 14w34c
Sonicwave
Confirmed for 1.8-pre2.
Sonicwave
Confirmed for 1.8.
Sonicwave
Confirmed for 1.8.1-pre1.
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confirmed for 1.8.1 pre-3
wobst.michael
Seems to be fixed. Not able to reproduce in 15w44b.
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Fixed at some point between 1.8.2-pre4 and 15w44b.
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Confirmed for 15w45a.
Saplings don't burn.
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Confirmed for 15w46a
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Affects 15w47a
tomudding
Confirmed for 15w49a
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Confirmed for release 1.9, however flowers and dead bushes seem to be burning as intended.
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Confirmed for 16w14a
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Confirmed for 1.9.4
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Confirmed for 16w21b
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Confirmed for 1.10-pre1
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Still in Release 1.10
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Still in 1.10.2
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Included it in MC-3263.