Tier 1 Power Root (10% power)
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Bone small decaying bone
Fertalizer pouch of peat
Water flask of rancid water
Tier 2 Power Root (12% power)
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Bone large decaying bone
Fertalizer small bag of ammonium sulphate
Water flask of stale water
Tier 3 Power Root (14% power)
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Bone small polished bone
Fertalizer small bag of muriate of potash
Water flask of pond water
Tier 4 Power Root (16% power)
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Bone large polished bone
Fertalizer small bag of diatomaceous earth
Water flask of fresh water
Tier 5 Power Root (18% power)
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Bone small meaty bone
Fertalizer small bag of ammonium nitrate
Water flask of pure water
Tier 7 Power Root (22% power)
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Bone large meaty bone
Fertalizer small bag of compost
Water flask of enchanted water
The full plant guide can be found here.
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Basically these are 6 items you will want to carry at all times, they are extremely useful in raids especially with mobs that have power drains. The combonation needed to produce one is 2 compost, then 1 water, then 3 bones. I have found its easy to use all tier 7 compost and bones and to swap out the water. Most of these compenents go for 1-3g, So for about 10-15g per item.
As far as I know there is NO tier 6 power root.