Keep plants well-watered during the growing season, especially during dry spells. Plants need about 1-2 inches of rain per week during the growing season. It's best to water with a drip or trickle system that delivers water at low pressure at the soil level. Water early in the day so the foliage has time to dry off before evening, to minimize disease problems. Keep the soil moist but not saturated.
If growing on stakes: As the plants grow, allow only one or two main stems to grow and pinch out any other side shoots as they form. Gently tie the one or two remaining shoots to the stake; don't pull them tightly against the stake. If growing in cages, no pruning is necessary.