10ac Natural planting medium. (4) (??l?) 11ac Variety of Hedychium densiflorum that sounds like it yields a fruit tea. (5-6) (???a?-????e?) 13ac Orinoco (4)(???w) award- winning variety ofiris that shares its name with Enya`s1988 debut N o 1. 17ac Castle , Scotland, famous for it`s walled (great garden` of 1604, unique in Europe.(6) (???e??) 18ac Type of 10 across with a ph value of less than 7. (4) (?c??)