I need a little help with Trigun

If you have not seen this series and do not want to know the storyline or the ending I suggest you read no further.
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Still with me? Good. Now maybe someone out there can help me understand the ending. It’s not so much the ending that confuses me, it’s Vash’s origins that really get to me. The dude is really a plant from what I understand, but how is he and his brother for that matter so quick? I thought plants barely moved. What was the purpose of making them in human form? Why couldn’t the earthlings simply get a bunch of plants and bring them on the ship?

HELP!

im not sure but ive seen many things like tv and movies where creatures are actualy plants even though they move and talk and all ever seen farscape? the blue women in it is a plant and she runs alot and is a japper-mouth

Well as far as I understood it him and his brother were both created as an expirament on a group of ships that deserted earth. Alot of the technology they use is supposedly from the "anchents" or somthing like that. The power sourses are realy beings like vash and knives that are imprisoned to harness their energy. They are unaffected by time, but I dont remember anything about plants…unless you mean power plants.
What I think happend was that the humans killed one of the powerfull beings and then took its dna to make vash and knives. Also the reason they moved so fast was due to being bio engeneered or somthing, some of the humans were as quick as them, Its just like DBZ or somthing…alot of training.

o yeah, i forgot about those things used as power! I remeber them having a connection now! But I do remeber them saying that they were plants. They had this discussion. O well, thanx for clearing that part up.