The colour can fade in hot climates. It may also need protection from fungal diseases. 2
Try to plant in a location that enjoys full sun and remember to water moderately. Keep in mind when planting that Sonia is thought of as hardy, so this plant will survive close to or on freezing temperatures. Sonia requires a loamy soil with a ph of 5.5 - 7.0 - it grows best in weakly acidic soil to neutral soil.As a hybrid variety, this plant will not reliably grow true to type from seed.
US Patent PP3,095 has expired. 1
Registration name: MEIhelvet
Named for Alain Meilland’s daughter. 1
‘Sonia’ is the rose which has been the biggest commercial success in the world with about 40 million plants sold. 1
This is probably the most popular greenhouse rose in the world. ‘Sonia’ was one of the top money earners for the House of Meilland. 2
Sonia Meilland, Sonja, Sweet Promise
2 “Botanica’s Roses”