Unlike most seeds, dragon tree seeds have a very tough outer shell. This protects the seeds as they pass through birds' digestive tracts in their natural habitat, allowing them to be dispersed in various locations, but it also makes it more difficult for growers to germinate the seed. To break this coat and allow water into the seed, scarification is key. Scarification involves nicking or breaking the outer coat of seeds to speed up the germination process. Usually sandpaper is used, though knives can also work for larger seeds. I found that sandpaper worked fine for these relatively small seeds (~5mm in diameter). Scarification is also useful for other plants with tough seeds, such as bluebonnets.
|Notice the dark orange outer coat and the exposed white surface of the seed|