Frost resistant passion flowers
You can plant these at best against a fence, wall or pergola, preferable avoiding a north, north-western wind. Give them enough space to grow, because for example species like Caerulea can grow 5m a year. Make something you can lead the plant against, especially in the beginning you have to help them with that. In case the passion flower grows to fast, you can simply cut them back. As of October grow will reduce, but sometimes the flourishing will continue, it all depends of the weather. After the first frost the leaves will quickly fall off. The first winter season, you will have to cover the roots of recently planted passion flowers with organic material; like pineapple needles, cacao peels or old fashioned peat dust. At harsh winters, you can use also bubble foil or membrane screen for extra protection. It depends on spring how fast everything will grow, but with passion flowers it can usually take a while. From the moment the grow starts again it suddenly can go pretty fast. When you have you passion flowers planted directly in your gardens soil, don’t use too much fertilizer. We recommend using organic fertilizer which is usually available at garden centers.
As Container plant
Throughout the most species of passion flower can be grown in a container, these are the ones that will have to be moved inside to survive the winter period. If the circumstances are good enough to move them outside again, the moment has also arrive to put them in a larger container. Use always soil that drains well, which you can reach by adding some perlite. Usually the growing soil in a container is enough to feed the passion flowers for about 3 weeks, after that you can fertilize them every 2 weeks. But still, watch out that the plant won’t grow to extraordinary, which means it gets too much fertilizer and this will have a negative effect on the creation of buds. The first time fertilizing after you have put the passion flower in a bigger container, you can use at best a fertilizer with a higher number of phosphor (P), which helps in the grow of the root system. After a while you can start using fertilizer with a higher number of nitrogen (N), which helps in a healthy grow. Once the passion flower is growing well, you can add fertilizer with a higher number of potassium (K) which helps in getting a firm plant and the creation of buds. You can also plant the passion flowers still in the container, directly in the garden. This way they stand a bit more solid and the soil won’t dry out to quick, other advantage is that the root system won’t get to hot in the summer. Of course you can also put them on your terrace or balcony, however in this case it will be better to plant your passion flowers in pottery / stoneware containers, in which the rooting system will stay cooler as in plastic containers. Pay attention that the plants don’t dry out to much, especially in the summer season when the plant are in full grow, they evaporate quite a lot of water. The best time to water them is in the early morning, when the temperatures are still low. With a lot of rain the soil can also get to wet, so it is very important to use containers which drain well. On the web site of Henk Wouters you can find a perfect working automatic watering system for sale, which is ideal for people who go on holidays. When the plants start growing you need to lead them, bamboo is excellent for this, but also wire mesh, a pergola or a rose arch are suitable for this.
These will do fine in a conservatory or a greenhouse, which you can keep warm in the winter.
Try to give this passion flowers their own space as most of the varieties will become large plants, in a greenhouse it’s preferable to plant them directly in the soil and not in a container. Especially the tropical species will create stunning looking flowers, often followed by eatable fruits. Keep a close eye on pest control, also in the winter season molds can show up. Take care of a good air circulation; you can reach this by using a ventilator.