I'm here at 17 with my paladin, and there is usually like 2 or 3 almost full groups around my lvl, so a lvl 20 would be more than fine, I think it's the best place to go at about 20, just get bound once off the boat and head to the mud pit where there's almost always people to group with and there's the best creatues for high teena and low 20's, so lvl 20 is a good lvl for OT as far as i'm concerned (and everyone else in the zone)
I think it would be too low.. I've been there recently at L30, and I'm the lowest in our group. We still die from time to time, and even if you stay near the zones, the L50 Dragoons get trained there.
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Vaal Halen 115 Bard Council of Norrath Xev>Druzzil Ro>Xegony Server
You can kill these guys all the way up to 27 and make great exp. Loot can reach as high as 2.5pp to 6 copper. Also, succulant sap and roots can drop as well. I think the sap can be made into poison by rogues, but i'm not totaly sure. They have no fraction hit, and will not help if you're attacking another succulant. Be sure to con, they have a super wide range of levels. Good luck!
Beware that there are many varities of these nasties that all look alike, with similar names, but their levels vary greatly. On the north side of The Overthere outpost, the succulants con red to me at level 20.
Tyldak Master Smith Shadow Knight Tallon Zek http://www.geocities.com/tyldaktallonz/