It is possible to sow directly around the olla!
It will be necessary to take the precaution of watering the ground well at the beginning because only the filling of the ollas will not be sufficient to germinate on the surface.
It is good to choose an olla for its shrubs or trees
A shrub will require a single olla and frequent watering to provide a larger irrigation radius. A tree, on the other hand, will require more than an olla when it is mature.