It does depend on the variety, but in most cases our 1 quart shrubs are shipped around 6” tall. We trim them every 2 weeks. Trimming encourages more branches for a fuller plant that produces more flowers. There are some exceptions for certain plants that can’t be trimmed.
Our 8” Pot/ 1 gallon shrub height will depend a little on when the plant ships. If shipped early in the season it may be around 8-10” tall, where a bit later in the spring a bit taller. We do go through and trim our gallon shrubs as well to encourage more branching. A fuller, well branched plant is more important to the plants health than a plant that is in flower.