Mayne 5865-B Nantucket Polyethylene Planter, 16" x 16", Black This is the perfect compliment to our Nantucket tall planter and window boxes. Create a designer look that will add plenty of style and charm to your home Double wall design featuring a sub-irrigation water system which encourages root growth Outside dimensions: 16"l x 16"W x 16"H. Inside dimensions: 11.9"L x 11.9"W x 11"d. Soil capacity is approximately 5 gallons (19 litters), water capacity is approximately is 3.7 gallons (14 litters) The weather-proof and ultra-tough construction allows you to enjoy your window box all Year long with very little winter preparation 15 Year Warranty - residential application, 5 Year Warranty - commercial application. Made in the USA