The smaller Fireball types, Fireball, Donger, Zoe, & Red Waif are often planted 3ppp in a 5 or 6 inch pot to fill up the pot quickly. These types are branching and the best effect is achieved when they are allowed to start branching before selling. If you plant these 1ppp, it will take significantly longer to achieve the desired effect. Beware! When they get too mature in a small pot, they are apt to topple over from being top heavy. When growing a 4 inch, these types are good and can be planted 1ppp.
The Fireball varieties are also used 5ppp in an 8” pot or a 10” hanging basket.