3 Important elements to make Horticulture sustainable are:
Soil management: includes taking measures to reduce erotion, using as few pesticides as possible, and ideally, sticking to organic methods.
Water management: consists in the rational use of water, protecting water sources, and trying to recycle the water supply.
Crop management: only crops that are suitable for the soil should be planted. Crops should be rotated as well, since crop rotation is good for the soil.