How fast does pyracantha Firethorn grow?
Correspondingly, can you grow pyracantha from berries?
Pyracantha produce most of their new stems in spring but these will not flower or produce berries in that first year, they flower and produce berries in the next year. For the first two to three years after planting a new pyracantha, let it fill out and don't prune it.
Secondly, can pyracantha be hard pruned?
You can prune Pyracantha hard (remove a great deal of growth) without harming the plant. If your goal is a more formal appearance, you can head back making selected cuts that will create a formal shape.
These rows will need to be spaced 70-100cm apart, with 60-90cm (2-3ft) between each plant in the two rows. A single row of pyracantha, will form a hedge up to 4ft wide, with this in mind its not very often you would need to plant double rows, as a 4ft width is usually an adequate thickness for most gardens.