I'll see how I did it a few days ago, and put it in this post. Not now, however.
Ok, my way needs a bit of luck in one place, but otherwise needs less figuring odd stuff out (I think):
1) WHEYTWUT boss next to the Corrosive Plant
2) Hit one golem twice to kill him
3) Drink mana potion, convert WONNAFYT and WHEYTWUT, pick everything else up
4) Kill all but 3 plants (get corroded and cursed for every one)
5) Use IMAWAL on Corrosive Creeper, convert IMAWAL
6) Use Plantation, then Greenblod, then Clearance (there should be no more mushrooms on the map)
7) Use Entanglement - if a mushroom blocks the tile that leads to the golems, bad luck, try over, if not, keep going)
8) Use BURNDAYRAZ on boss
9) Kill both golems to lvl up
10) Use plantation, Fireball the boss, use GETINDARE, convert GETINDARE
11) Use Clerarance, Fireball the boss again, Convert Fireball
12) Kill the boss
Alternatively, you can keep 6 plants alive, and work the Greenblod into it later (I originally did it that way), but you have to time it right and covert BURNDAYRAZ later.
Looks convoluted, but is actually easier to discover naturally, or at least was for me.