I think the powers you've chosen look fine. You have listed Impale twice - did you mean Skewer there at level 10? Fling Thorns is a good cone attack. I would consider switching Entangle for Roots since it works well with Seeds - it keeps a group bunched up, and since you also have Fling Thorns it will allow you to really rack up the damage. Stealth might be a good power if you're not going down the Leaping pool path.
I went down a slightly peculiar path in that I took only single target damage powers, this was partly to save endurance and partly because I went for a balanced PvE/PvP build.
Ripper and Thorn Barrage are must-haves, your damage after taking these powers becomes much greater than before, a shame they aren't available earlier.
I recommend using Character Builder to plan your toon.
Sorry about that, I have edited it now, and the only reason I picked entangel over roots is that roots is slow and uses alot of endurance, and entangle is the opposite, makeing is effective on Lts and minios, and PvP. And how do you use the build software thing you recommended? could you give me some instructions as to intallation and usage?
You might have to install the .Net framework first, the link for that is there on the character builder page. It's pretty easy to use once installed, not much different from doing a respec, all the ATs are there and most of the information about powers seems fairly accurate.
The thing about Roots Vs Entangle is that you're right, Roots uses more endurance (it does recharge pretty fast though), but it does mesh very well with Confuse, and for you with Fling Thorns. If you dont use Roots any group you confuse will likely run around which means using your cone attack is much less effective - as is any AoE attack anyone else makes. Thorntrops would effectively do the same job although you get that much later.
I tried plant/thorn and the lack of control really got me down.
Vines the only AOE hold is just to short a duration to be anything but an agro switch and got me killed more times than i can remember.
Short duration - long recharge = lots of agro 
Defiant's GoEH/MILITIS METUS
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I tried plant/thorn and the lack of control really got me down.
Vines the only AOE hold is just to short a duration to be anything but an agro switch and got me killed more times than i can remember.
Short duration - long recharge = lots of agro
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The control is pretty good but it's based around Seeds of Confusion. Vines is tricky to justify with Plant/Thorns because you don't have Power Boost to get a longer duration so I skipped it. Carrion Creepers is a very good aggro grabber to use before attacking a difficult group. The only real problem with Plant is against Confuse resistant groups I deal with those by using only Creepers backed up by Strangler, but you can break through the resistance by using Domination.
Regarding Vines, I'm planning to take it with my Plant/Thorns (really enjoying it btw!) just for stacking mag and because I thought Aim could be used to take come of the suck out of it. My Ice/Ice needs to slot Glacier 2acc/2hold/2recharge and I was going to go for 3hold/3 recharge with Vines. It will still be pretty bad outside Domination, but no worse than controller AoE holds. Still wondering a bit if Roots or Thorntrops would benefit me more, though. Anyone have Thorntrops?
I hate that dominator secondaries always seem to make me want to get every single power. 
There are so many pool powers that would benefit doms too.
not really, I usually try to go for all ranged since dominators are squishy in melee combat, and sometimes if I don't need them I skip powers like aim and others. 
I have Thorntrops. Initially, I really didn't expect to use the power much, except as a way of slowing mobs getting to me. However, currently slotted with 1 dam and 1 range, I find that the damage from them is actually pretty good (at L37, I frequently get 9 points/tick out of them) - further slotting to follow at L39/40 should make it an even better power.
So yes, in conclusion, the 'trops are a useful addition to the arsenal (I tend to throw them into a group that I have immobilised with Creepers/Roots/my pet, or at any boss that I have successfully held already). Hope this helps.
To the OP, I would say that you might want to ignore the Spirit Tree power - it's not really that useful except in very rare circumstances, IMO. Pick an extra pool power, such as one of the leadership powers (as you presumably team a lot) and it will help the overall team damage/defence.
I suggest taking SJ instead of SS. I would take the added knockback/hold resistance from combat jumping/acrobatics rather tham faster power recycling that you get from hasten.
I skipped Skewer and got Impale instead. Spirit Tree is OK for me at the moment but no better than OK. Seeing as their seems to be a shortage of Corrupters whenever I play having some sort of healing can be quite useful - but the recharge time is high and the healing not that great.
The choices are very like the Rose Gardener, who can solo on the fourth difficulty level, which is more than I feel confident with for my other characters...
I haven't taken skewer, but at the moment it's a toss up between that and health - I don't like melee, but mobs end up in my face all the time, and an damaging melee attack could be a real bonus when a mob really really needs to be taken down quick...
I find SS great, it works as stealth for setting up seeds shots, and hasten is domination's best friend
EDIT: I'd suggest against Spirit Tree too, my MM has Triage Beacon, which is basically the same power, and it's just not that useful, and you're only getting the benefit once rather than the MM's seven times...
I would not miss out Skewer, it's your highest ST attack for a very long time; it is also a very fast animation unlike Impale which seems to take forever sometimes.
Both are good, but Impale has the added advantage of i) range, and ii) -FLY. Handy for those pesky types that like to hover just out of melee range
But I find I use both Impale _and_ Skewer a great deal...
Of course you must take both.
Bizzarely then, I'm finding the confusion from Seed's isn't overly scattering mobs that much at all.
Yes, roots does back it all up & keeps them even tighter, but I've actually 'specced Roots out to no detriment at all.
Like Filth I built to single target attacks. I did also take Vines however to stack & break anything particulary resilient. It works a treat, & there's not really much you can't break in a few seconds with 'em chained 
.
I slotted for very fast holds over duration to get them stacked & find it works great for my style. In big teams my buddies wipe all the stuff out before it breaks hold anyway, & solo I flick around stacking anything overly dangerous or outside the conrtol of Seeds' or 'Creepers. The I get stuck in .
Definitely consider taking Skewer much much earlier. Same reasons as mentioned - it's really you're best attack until much later.
Your Dom' might be on the squishy side, but don't be afraid to get stuck in & vicious . Your primaries will keep stuff occupied enough that you can get right into the thick of it.
Personally I took the Leaping set for travel. It was more a character choice, but acrobatics has been a constant lifesaver . You can't hold anything when you're getting batted around every wall of a dingy Council base .
Plants/Thorns is a great villainous set of powers & incredible fun. Hope you have as much fun too .
The Flytrap & Thorn Barrage are worth all the effort levelling to them & I wish there'd be even more than another 10 levels to take 'em through with i7 .
Interesting note on Thorntrops. Now I'm thinking about taking them as I probably won't take a Patron (just didn't find anything that fitted with my Dom' character).
Thanks for Thorntrops info, Doc! It sounds like a pretty solid choice and now I'm planning to take it instead of Roots and slot it for damage (as damage in Roots doesn't look too hot). Along with my duo partner's Tar Patch that should keep things in place.
It does unnerve me slightly that I have, at level 24, picked only two powers from my primary. But hey, at least I 6-slotted both of them.
OK, dominators aren't exactily my speciality and I plan on making a plant/thorn dominator, so I'm posting my nuild here whichc I might try to fulfill.
Level 1: Strangler
level 1: Thorny Dart
Level 2: Entangle
Level 4: Fling Thorns
Level 6: Hasten
Level 8: Hurdle
Level 10: Impale
Level 12: Seeds of Confusion
Level 14: Super Speed
Level 16: Spirit Tree
Level 18: Health
Level 20: Stamina
Level 22: Vines
Level 24: Skewer
Level 26: Carrion Creepers
Level 28: Thorntrops
Level 30: Stealth
Level 32: Fly Trap
Level 35: Ripper
Level 38: Thorn Barrage
Feel free to post your own builds here, and plkease tell me what you think of this build nad post appropriate enhancement recommendations if you can.