| Regno | Plantae |
| Sottoregno | Tracheobionta |
| Superdivisione | Spermatophyta |
| Divisione | Magnoliophyta |
| Classe | Magnoliopsida |
| Ordine | Malpighiales |
| Famiglia | Clusiaceae |
| Genere | Clusia |
Clusia, commonly referred to as Autograph Tree or Pitch Apple, is a captivating genus of tropical plants renowned for their versatile growth habits and resilience. The genus includes around 300 species, each boasting unique foliage, growth forms, and flowers. Clusia plants are prized for their ornamental value and are popular both as houseplants and garden specimens.
Clusia (Autograph Tree) thrives in bright, indirect light to some direct sun. A spot near a south- or east-facing window is ideal. More light produces denser, sturdier growth. It tolerates moderate shade but growth slows significantly. Outdoors in tropical climates, Clusia grows in full sun.
Allow the top 3–5 cm of soil to dry between waterings. Clusia stores water in its thick, leathery leaves and is reasonably drought-tolerant. Overwatering causes root rot and yellowing. Water very sparingly in winter — once every 2–3 weeks is often sufficient.
Well-draining, slightly sandy potting mix: 50% potting compost, 30% perlite, 20% coarse sand. Good drainage is essential.
Optimal 18–27 °C; minimum 10 °C. Tolerates dry indoor air well — one of the more humidity-tolerant tropical plants. Standard indoor conditions are adequate.
Feed monthly during spring and summer with a balanced liquid fertilizer at full strength. Stop in autumn and winter.
Prune to control size in spring. Clusia responds well to pruning and can be shaped into a bushy shrub. The thick leaves are leathery enough to be 'autographed' with a fingernail — text inscribed heals over in contrasting colour, which is the origin of the common name.
The most common method for propagating Clusia is by cuttings. This involves taking a section of the stem and rooting it. Ensure the parent plant is healthy before proceeding.
Some Clusia species produce offsets, or "pups," which can be separated from the parent plant and potted individually.