Thuja standishii (Gord.) Carr. Japanese Thuja or Japanese Arbor-vitae Native to central Japan, grown in botanical collections and gardens. Height to about 20m (65ft) in cultivation. Flowers open in March, males dark reddish turning yellow when shedding pollen, females brownish green, both about 0.1cm (1/20in) across. Cones are about 1.2cm (½in) with 10-12 scales, ripening from bright green to dark brown in the autumn. Leaves are dull yellowish green or greyish above with patches of grey at leaf bases beneath. The shoots are often curved at the tip and have a lemony smell when crushed. Zone 6