How Much Water for Passion Flower Vines?

Types of Water

• The chemicals and minerals in regular tap water may harm the delicate roots of your passion flower vine. For best results, irrigate with collected rainwater; purified, filtered and spring water can also be used without fear of harming the plant. If you still prefer to irrigate your passion flower vine with tap water, allow the water to sit undisturbed for at least 24 hours to allow the offensive chemicals to dissipate.

Watering Garden-Grown Passion Flower

• According to California Rare Fruit Growers, passion flower vines will flower and bear fruit almost continuously in their ideal climates if provided with frequent irrigation. Give ground-grown passion flower vines approximately 1 inch of supplemental irrigation each week. Increase the amount of irrigation to 1 1/2-inches per week when the passion fruits start to approach maturity; if the soil is kept too dry during this particular stage of growth, the passion fruits may shrivel and drop prematurely.

Watering Container-Grown Passion Flower

• Container-grown passion flower vines require more frequent watering than their ground-grown counterparts, according to Easy to Grow Bulbs. Check the moisture of the vine's growing medium every two to three days. Water as often as necessary to maintain moist growing medium for your passion flower vine during the spring and summer months. Reduce the frequency of irrigation during the fall and winter; allow the surface of the growing medium to dry to the touch between irrigations.

Dangers of Overwatering

• Though regular irrigation is essential to successful passion flower vine cultivation, too much of a good thing can be deadly. Overwatering is a quick and easy way to kill a previously thriving passion flower vine. To avoid root rot and other overwatering-related complications, always plant passion flower vines in well-draining soil or growing medium. Never allow the soil or growing medium that your passion flower vine is growing in to become soggy or waterlogged.