Ricinus communis or ‘Castor Oil plants’ are some of the most impressive tropical plants that you can grow from seed for your garden. These tropical jungle giants grow to enormous architectural plants in just one growing season. Ricinus (castor oil plants) are not difficult to grow from seed and can be grown easily on a sunny windowsill. Ricinus plants grow well in the UK and other temperate climates but do need staking against strong winds. The plants are highly toxic, so please take care when handling the plants and especially the seeds.