One is a regular lilac but still small; the other is a dwarf variety, already about three feet tall.
The dwarf variety should do much better, assuming that by large pot you mean at least two feet square.
These are typically smaller specimens, and it is possible that they represent a dwarf variety.
A dwarf variety, it has been considered "too small for common size bonsai".
Some dwarf varieties can do well in planters, such as large truck tires.
But don't order the dwarf variety by mistake.
There are dwarf varieties as well, which grow to only two feet and are hardy enough to stay in the ground all winter.
A pine has been named after him - ironically, given Maléter's height, a dwarf variety.
Although there are dwarf varieties the only grow up to eight inches in height.
The dwarf varieties can be planted in a border.