The plant needs air and light

If a plant is not in the light, it does not grow well.
Light does not come through the leaves of a dense mango tree, and almost nothing grows under it.
Grass needs light to grow.

Plants get most good from air and light:

· if you pull out weeds;

· if you prune trees such as coffee, cocoa.

· if you grow crops on fairly high ridges, as with groundnuts, cotton, salad plants.

· if you make stems climb on sticks or branches, for instance, cowpeas, tomatoes, yams.

Weeds and cotton

With good air circulation, there is less disease.
Well ventilated plants resist disease better.

Figure