year a self-seeded passionfruit came up in my vegetable garden.
I trained it along a trellis and it grew well, flowered and set
fruit. Some of the fruit developed round marks and some nearby leaves
fell off, but leaves and fruit further along the same stems were
not affected. Was this a deficiency in the soil? If so, why didn't
it affect all the fruit and how should I prune the vine?
sounds as if your vine has been affected by one of the leaf spot
diseases that passionfruit can suffer from. They tend to be worse
in wet, cool conditions, so it sounds like the infection didn't
spread to the rest of the plant once the weather improved. To avoid
the same problem in the future, you could give the vine an occasional
spray with a copper-based fungicide, such as Super Copper, especially
during cool, wet conditions.
Often, they don't need
much pruning apart from thinning out a few shoots if growth is excessively
dense, to open up the centre of the vine to the light or to cut
back very long shoots. Don't cut them hard back overall. You can
prune after all the fruit is finished or in early spring.
Passionfruit vines need
lots of nutrients to encourage fresh new growth and lots of fruit,
so a fertile vegetable garden is an ideal place for one. They are
relatively shortlived, however, and after four years or so may lose
vigour and need replacing.
Gardener, Issue 197, 2006, Page 29
Reproduced with permission from the former Weekend Gardener magazine. The views expressed here are not necessarily those of the RNZIH.