Results of preliminary studies on root-systems of New Zealand flax (Phormium tenax Forster), sisal (Agave sisalana Perrine), and imperial bamboo (Bambusa vulgaris Schrad. var. vittata A. & C. Riv.) plants by the method of soil block, are apresented and discussed by the authors. According to local soil conditions, it is concluded that the root-system of New Zealand flax is relatively superficial, with the main concentration of roots in the 12 in. soil top layer. In sisal, the root-systems of the three plants investigated were found to occur in the soil surface layer, with more of 90% of the roots in the top 6 in. Finally, in the imperial bamboo clump atudied, the main concentration of roots was found in the layer 6-12 in. deep.