The zone scales to your adventure level and the bixies will be 10-15 levels higher than you.
Use the Soporific Dispensorator to put the bixies to sleep and gather jumjum from the fountain in the middle of the room at ( -72, 62, -24 ) Copy/waypoint -72, 62, -24.
This is a solo quest. If you are in a group, you'll be removed from it. Mercenaries are allowed.
It's recommended you move the Soporific Dispensorator to your hotbar, as you'll use it often in this quest.
This item sets off a smoke bomb that puts the bixies to sleep so you can pass by them safely. Note that it doesn't just stun them, it turns them into non-aggressive mobs that cannot be attacked.
Its cooldown is minimal, so use it frequently; run back into the smoke if you get too close to a bixie that was hiding around a corner.
If you are adventure level 100+ you can simply run to the fountain, kill any bixies who've followed you and collect the jumjum without using the Soporific Dispensorator.
Proceed carefully, but if you do get killed you will revive back in Neeta Cabbageleaf.
The soporific will be in your bags when you zone into the tower.