They are exactly right in the id area. The dracaena does need repotting but if at all possible I would not divide it, just put it in a larger pot. It is a plant
that gets very tall. But does better somewhat rootbound. However if you want to divide take it from the soil, find the center of the root systen between the parent and the offset and make a clean cut with a sharp knife or pruning shears, then repot in an all purpose mix. water well. The dracaena,asI'm sure you know, looses its leaves as it grows so don't worry if you start to see brown leaves at the bottom of the plant
. It typicaly maintains the shape of a palm like plant
. Heres a tip-- once it gets a little larger, you can knick the side of the stalk or cut the top from one of the shoots and it will put out new shoots on either side of the original stalk. Makes for an interesting looking plant
but I would not recommend this until the plant
its two to three times the size it is now. Hope this helps some...
BTW-- do you have a pic of that spider plant