Seed germination, sowing instructions for Passion flower. Passiflora incarnata is easy to grow from seeds. Evergreen, fast growing climber. Pre-soak seed overnight in warm water. Best sowing time is winter or early spring. Germination can take several months! Prick out the seedlings into individual pots when they are large enough to handle. If you want to grow your plants outdoors, it is best to keep them in the house/greenhouse for their first winter and plant them out into their permanent positions in late spring, after the last expected frosts. Passiflora prefers a moist but well drained soil, and sunny location. Hardy to about -15 degrees C. To overwinter outdoors, cut down to the ground and mulch the roots well in late autumn to protect them from the cold.
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