If we don't grow that population in our own way by knowing the spacing within and between rows, we need a good clear picture, the divide it into squares, count how many plants in each then multiply x number of squares you have of that picture, simple method. Cheers.
Odilbek Mamatqosimov It's the Quadrant Method - For stationary animals like plants, or very small and slow-moving organisms, plots called quadrats can be used to estimate population size and density. Within the habitat, each quadrat marks off an area of the same size—typically a square area.