Full sun is ideal for all Nasturtium species. Plant them where they get at least 6-8 hours of direct sunlight.
Unlike other colorful flower-plants nasturtium does not require rich, fertile soil. You can grow them in average or lean soil with good drainage.
Nasturtiums become bit drought tolerance, once they get established. Usually, they prefer moderate watering (Once a week) to keep its soil mosit.
Just like any other plant Nasturtium also need trimming or pruning occasionally. Nasturtium varieties grow fast, so you have to trim them to maintain its shape.
You do not need to fertilize nasturtium in any season. They can thrive in dry and average soil, adding fertilizer will increase production of foliage and not flowers.
Learn More about How to grow and care for Nasturtiums.