Stewart Piazza Trough Decorative Plastic Planter - Granite Effect A quality Stewart Piazza heavy duty plastic patio planter with a dark granite effect finish - 60cm wide. FREE POSTAGE £19.80 Quantity: at £19.80 each Add To Basket A quality Stewart Piazza ornamental plastic planter. Made in the UK from heavy duty quality plastic. Dark granite effect colour. Size 60cm wide, 26cm wide, 25cm high. 19 Litre capacity.