Fig. 2. Ectomycorrhizal (with Hebeloma syrjense) (+M) and non‐ectomycorrhizal (–M) willow trees (Salix sp.) with (+B) and without (–B) organic nutrient patch addition, showing typical growth and colour differences at harvest. Note bean cotyledons can be seen heavily colonized with mycelium in +M+B treatment only (white patches in substrate in jars).