The design and use of a modified heating block that is adaptable to routine plant tissue digestion is presented. The block was constructed from two aluminum plates: the heat‐transfer plate (50.8 cm × 30.5 cm × 5.08 cm) and the test tube support plate (50.8 cm × 30.5 cm × 0.953 cm). The block can digest 50 samples simultaneously, requires limited laboratory space, and is very economical to construct and operate.