Interstellar is out of this world! Deep purple flowers and fantastic variegated foliage. Plant bulbs 10-15cm (4-6in) apart and twice their height deep. After flowering, feed with a high potash fertiliser, such as tomato feed, to encourage large bulbs to form. Lift and separate bulbs in autumn. Cultivate the soild to a depth of 10cms anplant iris 5cms deep an 4cm apart.