Giant dioon will grow in soils having little nutrients, in limestone-rich soils and on moderate slopes. Although tolerant of poor soils, the giant dioon s growth can be greatly improved through the application of fertilizers. Most growers find that a fertilizer having an even NPK balance, and supplemented with trace elements, provides a good start for cycads. Cycads may then be kept growing well with regular applications of a balanced slow release formulation such as Osmocote or Dynamite. The giant dioon may be grown in partial shade, filtered sun or full sun.
Giant dioon prefers partial shade or partial sun to full sun.
The giant dioon prefers moist to wet soil with good drainage and regular watering for optimal growth. Mature and established plants have been reported to tolerate temperatures down to 25 F for short time periods, without incurring significant foliage damage. The giant dioon may be propagated by seeds or by division and replanting of the attractive offsets or pups formed at the base of the plant. The seeds of the giant dioon are reported to be exceptionally easy to germinate. Usage Giant dioon is wonderful as a tub plant in a brightly lit spot in the home, on a porch or deck, or in a conservatory.