Maris Otter Pale Ale Malt1. 5 1. 8 L Crisp Malt lCrisp No. 19 Maris Otter Malt (formerly Gleneagles Maris Otter) is an heirloom varietal that is World renowned for its deep, rich flavor. It is considered Heirloom because it is an old variety with a very low yield of 1. 5 2 tons per acre. Modern varietals now produce up to 4 tons per acre. Why do farmers grow Maris Otter when new high yield, disease resistant varietals are available? Because Craft Brewers around the World are