How to grow Rock cress 'Royal Blue'
Keep in mind when planting that Royal Blue is thought of as hardy, so this plant will survive close to or on freezing temperatures.
Growing Royal Blue from seed
Soil temperature should be kept higher than 10°C / 50°F to ensure good germination.
Transplanting Royal Blue
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Royal Blue is a hardy plant.
Harvesting Royal Blue