READY EARLY SUMMER. The giant summer hyacinth – a plant that definitely has the ‘wow’ factor. The tall sturdy flower spike bears in late summer up to thirty highly-scented bell shaped flowers with serrated edges amid long strap-like leaves. You can’t miss it wherever you put it in your garden. Sun or semi-shade. Moist but well drained soil. 3 feet. 3 litre deep pot.