Blooming through the spring and summer months, it has a mix of brightly coloured, semi-double flowers. Not only a great companion plant, attracting bees and trapping snails, this is the ultimate root to bloom with every part of the plant being edible. Consistently self seeds. When to Plant Zone 1: October - April Zone 2: September - May Zone 3: Any Zone 4: Any For zone map CLICK HERE Soil Nasturtiums thrive in most soil types but prefer a well drained soil that is prepared with compost. Fertilising the plants excessively will put on mostly vegetative growth and flower development will be low, so feed your plants moderately. Soil pH Level 6.5-7.5 Position Prefer part shade. How to Plant For faster germination soak seeds overnight in water and then plant directly into the veggie patch. Keep watered until germination. Plants have a tendency to burn in direct afternoon sunlight, so morning sunlight is preferable.