Thanks for reply that my passionfruit vine from pics has mosaic virus. Is this treatable in any way or should I remove the plant.
No, this will not be treatable, and will be permanent in the soil. You will either have to plant future plants in container, or in another area completely.
I thought just looking at the leaves , it was a passion fruit vine. then these tiny green fruit appeared and it turned dark purple/black. I was brave enough to taste it and it was anything but a passion fruit.. It had 1 large seed and it had no flavour
That is, definitely, Passiflora suberosa. The Cork Passionflower.
It just may not be the kind that you are familiar with.
They will have similar care to other Passiflora:
https://www.gardeningknowhow.com/ornamental/vines/passion-flower/passion-flower-care.htm
I'm rebuilding my home in the Bahamas, following the effects of Hurricane Dorian and I would like to include a passionfruit vine "tunnel" to the side door to the house (a distance of about 15m). I intend to build a pergola structure parallel to the side of the house. Upright 4x4 posts will be set in concrete, about 1.5m out from the line of the side of the house. They will connect at the top to horizontal beams resting on brackets on the wall. Strong wire will span between the posts and beams. The vines will be rooted in block and render planters about 1m. deep, positioned between the posts. I plan to plant a mix of Panama Gold and Panama red varieties. My questions are these; (1) What would be the recommended distance between posts? (2) Is the suggested depth of the planters suitable? (3) Is there a clever way to prevent the vine tendrils from "attacking the soffit or any other vulnerable part of the wall or roof? Very many thanks for any advice! Ian
yard. Can they propagate from seeds dropped from flowers?
No, in order to produce seeds it has to flower and fruit completely. The fruit is what holds seeds. If it doesn't fruit, then you could be lacking potassium, and possibly phosphorus. If you have flowers, though, then it is just likely a potassium deficiency.
This can also happen if there is too much nitrogen in the soil, in which case it can be fixed, also, by adding phosphorus and potassium.
https://www.gardeningknowhow.com/ornamental/vines/passion-flower/passion-flower-not-fruiting.htm
I planted a young maypop passionflower vine and it hasn't grown any, and some of the leaves have got brown spots as in the picture. It's been in the ground around 3 weeks so I'm not sure if it would still be suffering from transplant shock. Looking for some advice on whether the plant can be saved (or whether it even needs to be saved)!
It may be wind damage and even a bit of sun scorch on the leaves. It also could be from water splashing onto the leaves and burning from sun.
Try to avoid water splashing onto the leaves; it can cause fungal diseases.
https://www.gardeningknowhow.com/ornamental/vines/passion-flower/passion-flower-care.htm
https://www.gardeningknowhow.com/ornamental/vines/passion-flower/passion-vine-diseases.htm
I fix it? I have a sweet granadilla vine that has produced so many flower buds. Most of them will start opening and then just stop before they are fully open and start to shrivel. Eventually the drop to the ground. I am so keen to know what causes this problem and how I can fix it, because the vine still have lots of buds that have not started to open
This is typical of a few common problems.
The first thing that I would take a look at is your pH. Soil that is too acidic can lock out phosphorus and potassium. We are more concerned with phosphorus in this case.
That brings me to the next possible cause. Too much nitrogen. This will make the soil acidic, as well as lock out other nutrients, compounding onto the problem.
Poor soil nutrients, in general will usually cause other symptoms as well. I am not seeing much of that.
Here are some articles that will help:
https://www.gardeningknowhow.com/ornamental/vines/passion-flower/passion-flower-care.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
passion vine not flowering after additional dose of Osmocote.
No, adding more fertilizer on top of too much fertilizer will end the plant. As of now, you will need to let those leech from the soil over time. Once the fertilizer returns to a less rich state, it will start to recover.
Just have patience until it recovers, and you will eventually be rewarded with a healthy plant.