Choose a sunny spot and then boost the soil with compost, manure and certified organic pelletised fertiliser. A dose of lime is also beneficial. Soil needs to be free draining as these plants rot easily if the roots sit in water. Clay soils are not ideal but if that’s all you have then treat with gypsum and plant on a raised mound. Alternatively they will happily grow in a large pot. Dragon fruit is a tropical fruit native to Mexico and Central America.