Bronze Fennel Seeds 200 Bronze Fennel Seeds £2.00 Out of stock. Bronze Fennel - Pack of 200 SeedsFoeniculum vulgare ‘Purpureum’ Sow: April to May Harvest: August to OctoberHeight: 1.8m+Bronze leaved form. Perennial herb that will reach heights of 1.8 metres when established. Fantastic at the back of a border. Sowing instructions: Start in Jiffy 7C pellets (available here) or seed trays, then pot on into 7cm pots, and again into 9cm before planting out in late spring/early summer. Need moderate heat to germinate - the warmth of a sunny windowsill will be enough. Seeds germinate in 7-14 days.Growing instructions:Best grown in moderately fertile soil. Established plants will reach 2 metres in height and 50cm in width.