Red Hazelnut Tree | Corylus avellana 'Rote Zellernuss'This variety is a filbert (a type of hazelnut). An upright, deciduous small tree with colourful, heart shaped leaves which emerge dark purple in spring, turn green in summer and mature to maroon in autumn. Reliable crops of red or purple nuts in autumn. A neat, low maintenance little nut tree ideal for any size of garden, growing to just 3 x 3m and can be pruned smaller. Pink catkins appear in spring, attracting early pollinators. RHS Award of Garden