have you tried germinating a pomegrnate seed? Might succeed in a sheltered garden in London.
Ladybird, how big do the calamondin trees get? And can you overwinter them in a heated room (as opposed to a cool conservatory, which I don't have)?
We've germinated mango, date and citrus seeds. None of the plants lasted long in this climate though the citrus grew quite big in the bathroom.......unfortunately they had spines on them that could skewer a small dog so the plants had to go.
I am trying to grow guava. Still waiting for them to emerge. However I got a honey dew melon and water melon the size of my fist growing in my cold frame, both from the seeds of Tesco's melons!
There is an RHS book about getting plants from pips but the internet seems to have more detailed information.
I had an avocado stone germinate in the compost heap. I potted it up. I've no idea what I'm going to do with it.
I recently read an article in the telegraph about a guy growing fruits and spices for thai restaurants in London from his green house in Dorset, including papaya and green mangoes. All is possible if you are prepared to put in hard work, enormous amount of it!
Hi there, I live in the northwest of the UK and I have a grafted mango tree indoors, I also have germinated cinnamon seeds. I have turmeric and ginger from store bought roots growing indoors. If you don't have a greenhouse but do have sunny window sills you could try growing all sorts of tropicals. Chillis are the easiest to grow from harvesting the seed from shop bought and growing them on your windowsill.
I hav a mango tree germinated from supermarket fruit, it sprung up extremely quickly. No hope of fruits but the leaves are nice.
What you need is "The Pip Book" by Keith Mossman. My copy is 40 years old, you might be able to find it on Amazon. It's a small paperback.