There is a good guide for plant/thorns in the guide section, i'm using it for my plant/thorns but you could at least look over it for the plant powers. i agree alot with the guide, the only powers i dont feel are necessary are the single target immob and that tree thing. as for psi i have no experience with it. goodluck and welcome to CoH
On my Plant/Psi, the only powers I took from Plant were Stranger,Roots,Seeds,Carrion Creepers and Fly Trap. In Psi, I took everything but the snipe and Telekinetic Blast(which you may consider taking it for leveling, as it's much better now)
Make sure to pick up Seeds of Confusion as soon as possible, it really makes Plant shine. You don't have to get Stamina at 20 since you have Drain Psyche, but you'll need to pick it up eventually.
Thanks for the help. Any recommendations for ancillary pools other than fitness and speed? Would I need fighting pool?
Thanks again for the help.
I do just fine without Fighting. I did pick up Leadership for Tactics, though, along with Combat Jumping, although that was more for mobility than defense.
Also, I chose Mu for my Patron, simply for Power Sink and Power Surge. They're a good "Oh shi" button.
One of the best things about /Psi (imho), you don't really need Stamina. By lvl20 you are close to SOs anyway to give Drain Psyche enough recharge to bridge the gap. In higher lvls it will get easier anyway. My Plant/Psi made it to 50 mostly with regular SOs/IOs, more or less no sets.
With the recent changes to /Psi the road to 38 won't be as painful as before. The step to 38 won't be as magnifcient either, though 
. Psychic Scream now does more damage as Shockwave and depending on the position of the enemy you'll hit more as Shockwave radius is rather small now.
Here's a quick guide:
Entangle: Meh, most of the time Roots is better. See below for use of roots.
Strangler: Take it, you basic work horse for holds.
Roots: Take that too. It goes very well with Seeds. Use Seeds first, critters usually clump up when confused. Use Roots to make them stay clumped/avoid knockback powers. Use your AoEs to whittle them down.
Spore Burst: It's a sleep, so its use is situational. When you have to use it, it can be a life saver. Typical usage is to keep that 3rd group of critters quiet that you just agroed until the first two are under control or defeated. It's good mule for recharge slotting too.
Seeds: Best power in Plant/. With high recharge (close to perma dom) it will be up every fight. Combine it with Domination and you enter easy mode.
Spirit Tree: Meh. It's stationary and its buff is rather mediocre (imho). Took it for a while but does not suit the fast pace of most groups these days.
Vines: Group hold. Not high prio. Nice set options in higher lvls. Mostly used it to stack hold against nasty bosses.
Carrion Creepers: A beauty. Lovely to behold and extremely useful, especially in the lower levels. Place them to take the alpha of mean groups. Adds a bit to overall damage too. Suits the plant theme so well.
Fly Trap: Decent pet. I'd say you could probably skip it if you have a tight built. I like my Planty so I kept it all those lvls. Some nice slotting options too.
Psionic Dart: You gotta take it anyway. Combine with Brawl for fast Dom building.
Mind Probe: Nice melee damage. Use it to take down the big guys.
Telekinetic Thrust: Knockback can be put to good use defensively, especially in the lower lvls when your control options are limited.
Mental Blast: Used to suck big time, haven't tried it since the recent changes. Seems like a decent alternative to Mind Probe if you want to go ranged. I prefer close encounters. EDIT: Just checked on test, seems very similar to Subdue now, minus the immob.
Psychic Scream: Very nice cone damage. Narrow cone but very long range. With the recent changes: Take it, love it.
Drain Psyche: Best power in /Psi for me. Slotted up you won't need Stamina and you'll feel like a Regen scrapper. Also good against AV with its massive -regen.
Subdue: Nice ranged attack plus immob. Damage is slightly lower than Mind Probe but wicked range and immob.
Psionic Lance: I'm no fan of snipes. If you are, take it. Damage is good now and range truly evil.
Psychic Shockwave: Only a shadow of its past self. But that was massively out of balance compared to the rest of the set. Now it's slightly lower in damage than Scream. Still a very nice power.
Pool powers:
Speed is a must imho. Doms benefit greatly from recharge, Hasten comes in handy. Super Speed can be a pain but jet packs are cheap...
Fitness not required with Drain Psyche. You might want to take it for 20 - 40 or so if you run a end-heavy build. Won't need it in the higher lvls.
Flight I had for most of my leveling. Had to swap it out in my tight lvl50 build.
Leaping has Combat Jump for a nice def bonus (see below) and Super Jump I need not praise more.
Presence: Meh. You are a Dom, pool mez is for whimps.
Medicince: Had Aid Self for quite a while. Really helped in the lower lvls when there is no healer around (used to run with a Brute most of the time).
Teleport: Yet another travel power. Not much synergy to be found here.
I used to run a damage resi build lvls 40 - 50 but switched to a massive def build (40 - 45% def against most common stuff) and it increased survivability to a huge degree! So I use Fighting, Concealment and Leadership to stack def on top of Scorpion Shield for s/l/e and set boni for ranged def. Personal Force Field is a more potent panic button than any other epic power imho. Power Surge is nice but I found myself using it rather sparingly. I don't like crashes either. So these days I love Mace much better than Mu. Though decent resistance is probably cheaper to get than high def if you are on a low budget.
EDIT: Damage numbers are (based on PS damage):
Mind Probe 162%
Telekinetic Thrust 115%
Mental Blast 122%
Subdue 122%
Psionic Lance 266%
Psychic Scream 108%
Psychic Shockwave 100%
Heres my Domi.
He's still missing to purple sets, but thats him. Yes, it's an expensive *** build, but it will give you power choice selections. Keep in mind, the invis powers are there for the LotG's only. It's a perma domi and 203% recharge.Villain Plan by Mids' Villain Designer 1.601
http://www.cohplanner.com/
Click this DataLink to open the build!
Level 50 Magic Dominator
Primary Power Set: Plant Control
Secondary Power Set: Psionic Assault
Power Pool: Speed
Power Pool: Fitness
Power Pool: Concealment
Power Pool: Leaping
Ancillary Pool: Soul Mastery
Villain Profile:
Level 1: Strangler -- BasGaze-Acc/Hold(A), BasGaze-Acc/Rchg(3), BasGaze-Rchg/Hold(3), BasGaze-EndRdx/Rchg/Hold(19)
Level 1: Psionic Dart -- Apoc-Dmg(A), Apoc-Dmg/Rchg(25), Apoc-Acc/Dmg/Rchg(25), Apoc-Acc/Rchg(27), Apoc-Dmg/EndRdx(27)
Level 2: Entangle -- Decim-Acc/Dmg(A), Decim-Dmg/EndRdx(21), Decim-Dmg/Rchg(21), Decim-Acc/EndRdx/Rchg(23), Decim-Acc/Dmg/Rchg(23)
Level 4: Roots -- GravAnch-Immob(A), GravAnch-Immob/Rchg(5), GravAnch-Acc/Immob/Rchg(5), GravAnch-Acc/Rchg(17), GravAnch-Hold%(17), Posi-Dam%(19)
Level 6: Mind Probe -- Hectmb-Dmg(A), Hectmb-Dmg/Rchg(7), Hectmb-Acc/Dmg/Rchg(7), Hectmb-Acc/Rchg(9), Hectmb-Dam%(9)
Level 8: Hasten -- RechRdx-I(A), RechRdx-I(15), RechRdx-I(15)
Level 10: Seeds of Confusion -- CoPers-Conf(A), CoPers-Conf/Rchg(11), CoPers-Acc/Conf/Rchg(11), CoPers-Acc/Rchg(13), CoPers-Conf/EndRdx(13)
Level 12: Hurdle -- Empty(A)
Level 14: Super Speed -- Empty(A)
Level 16: Health -- Numna-Regen/Rcvry+(A), Mrcl-Rcvry+(29)
Level 18: Vines -- UbrkCons-Hold(A), UbrkCons-Hold/Rchg(43), UbrkCons-Acc/Hold/Rchg(46), UbrkCons-Acc/Rchg(46), UbrkCons-Dam%(48)
Level 20: Drain Psyche -- Dct'dW-Heal/EndRdx(A), Dct'dW-EndRdx/Rchg(31), Dct'dW-Heal/Rchg(31), Dct'dW-Heal/EndRdx/Rchg(31), Dct'dW-Rchg(34)
Level 22: Stamina -- Efficacy-EndMod(A), Efficacy-EndMod/Rchg(40), Efficacy-EndMod/Acc/Rchg(42), Efficacy-Acc/Rchg(42), Efficacy-EndMod/Acc(43), Efficacy-EndMod/EndRdx(43)
Level 24: Stealth -- LkGmblr-Rchg+(A)
Level 26: Carrion Creepers -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(29), Posi-Dmg/Rchg(34), Posi-Dmg/Rng(34), Posi-Dam%(37), TotHntr-Dam%(37)
Level 28: Invisibility -- LkGmblr-Rchg+(A)
Level 30: Grant Invisibility -- LkGmblr-Rchg+(A)
Level 32: Fly Trap -- S'bndAl-Dmg(A), S'bndAl-Acc/Rchg(33), S'bndAl-Acc/Dmg/Rchg(33), S'bndAl-Dmg/EndRdx(33)
Level 35: Psionic Lance -- Mantic-Acc/Dmg(A), Mantic-Dmg/EndRdx(36), Mantic-Acc/ActRdx/Rng(36), Mantic-Dmg/ActRdx/Rchg(36), Mantic-Dmg/EndRdx/Rchg(37)
Level 38: Psychic Shockwave -- Oblit-Dmg(A), Oblit-Acc/Rchg(39), Oblit-Dmg/Rchg(39), Oblit-Acc/Dmg/Rchg(39), Oblit-%Dam(40)
Level 41: Dark Embrace -- S'fstPrt-ResDam/Def+(A)
Level 44: Soul Drain -- Oblit-Acc/Rchg(A), Oblit-Dmg/Rchg(45), Oblit-Acc/Dmg/Rchg(45), Oblit-Acc/Dmg/EndRdx/Rchg(45), Oblit-Dmg(46)
Level 47: Psychic Scream -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(48), Posi-Dmg/Rchg(48), Posi-Dmg/Rng(50), Posi-Dam%(50)
Level 49: Combat Jumping -- LkGmblr-Rchg+(A), GftotA-Run+(50)
------------
Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 1: Domination
Code:
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either the dom boards are dead or my build is amazing....lol
Err...Not quite. I have no access to Mid's at the moment but if you put off vines until 24, skip sporeburst,entangler and Spirit Tree all the meh powers in plant you can take both mind probe and telekentic Blast for decent single target damage, AoE damage from roots+seeds+psychic scream by level 16, and completely eliminated all endurance problems by 22 with stamina and drain psyche. In terms of pools you have quite a bit of free space in powers 28, 30, and 35 allowing you to go with say leadership for assault, manuevers and even vengeance 
, Be able to get another self heal from the medical pool or fighting if you're so inclined for the toggles.
" Keep in mind, the invis powers are there for the LotG's only. It's a perma domi and 203% recharge"
Thats the "fluff" powers you speak of btw.
I also dont have sporeburst (which is only a sleep, mind you, and pointless) and entangle is also there for the recharge bonus in the set.
Please note my perma dom is a famer, and as such, has no need for a self heal, though I do know some that run with tough/weave, it isnt my bag o'chips 
Also no end problems with perma dom, DP, and the 2 procs. It sits pretty even given the attack rate and endurance burn of said attack rate.
Should have specified that it was a farm build to begin with but I assumed it would have shown. My appologies.
I really want to start a Dominator and am interested in the Plant Psi. I would be starting off with no inf, so would be something to build up over time. I just have no clue what powers to take and how to slot them. I have looked at the guides, but the Plant PSI is from 2006, so I am sure that is no longer accurate. Any help is appreciated. As a side note, I will most likely be doing a lot of solo stuff and no PVP, as my times to play are random.