Question

order the topics from broadest to narrowest. broader the role of nutrients in soil - less gardening unusual gardening techniques cultivating plants in water instead of soil

Explanation:

Unusual gardening techniques is a broad - category that can include various non - traditional methods. Cultivating plants in water instead of soil is a specific type of unusual gardening technique. The role of nutrients in soil - less gardening is a very specific aspect related to the practice of cultivating plants in water (a form of soil - less gardening).

Answer:

unusual gardening techniques, cultivating plants in water instead of soil, the role of nutrients in soil - less gardening