Yeah, the Brunei Darusulam book has a photo of a red type of b. macrocarpa on page 70.  It looks a lot like that.

I have s. affinis in production and it is dioecious.
Saludos, Peter

Duku, Langsat, and longkong all appear to be the same species or close enough.  They are not individually male and female, a single tree will produce.  Be prepared to wait a long time for production from a seedling of these.
Peter

The timing of a trip to Malaysia for fruits can be tricky.  There are a few sites/blogs with information regarding seasons.  Certainly the best would be to get some on the ground intel about available fruits and timing a couple of months before the trip.  That should be doable.
July and August supposedly are the best months for the East side of the Malay peninsula which could be pretty good in itself.  It’s also a good time for most of the rest of western Malaysia.  While some sites say it is more marginal for Sarawak and Sabah it is said to be strong for Brunei which is between the two.  It’s going to come down to whether or not Northern Borneo gets a dry season around February, March to get the fruit set we crave.
Peter

Thanks a lot for the information.  There’s a lot of markets, I suppose that timing is critical and that is really the random factor with success on a project like this.
Can you drive around Brunei or is it best to fly between Sarawak and Sabah, renting a car in each to access more remote fruit growing areas and markets?
Thanks,
Peter

We usually plant perennial peanut from cuttings but I have planted it from seed.  The seeds are somehow set deep in the ground, you aren’t likely to see them.  It makes eliminating it complicated.
Peter

I have been looking at a few sources for info and I know the blog cuts off Penang at the end of July.  I would get there about one week later.  Seasons are not so predictable.  Until the trees flower you can’t really know.
August seems good for Borneo and the Malay peninsula south of Penang.  Maybe later in the season the prices might be lower....
There’s a guy I know, Chris Hind, who is there now.  He is knowledgeable and rants quite a bit but his FB page is full of his recent travels in Central America and SE Asia.  A lot of great photos too.  He’s been finding lots of different durian species.
Peter

I don’t think it is correct that it has to be a very large tree.  A medium size tree, way smaller than green sapote could be planted at 6-8m spacing.
Peter

How drought tolerant is hemigraphis?  I’m not sure, depends on the drought.  Where I work we don’t get very dry weather.  It tolerates very well what we have.  Here we have two short dry seasons that can last a couple of months with some small amounts of rain.  The soil can develop cracks during this period and I’ve never seen hemigraphis fail in that situation. 
Peter

We cleft graft Chico sapote and keep the whole plant enclosed in plastic for a month.  The scion should have trimmed leaves and the root stock some leaves as well.
Peter

Biriba, rollinia.

I think that the tree had some scattered production earlier but say 5 years from seed to actual production since you need to be able to collect a fair amount of flowers.
I’m familiar with the fruit and am pretty convinced it doesn’t have any value aside from providing the seed for reproduction. This tree was planted from seed I personally collected in Oaxaca from the ripe fruit. I

I have been growing black pepper for 30 years and it has been a nice little business.
Nutmeg grows well for us.
Vanilla is worth growing if you can get into the demands of curing it.
Cardamom will probably grow for you there, nice plant and great spice.
Cinnamon is easy.
We have a collection of culinary gingers and turmerics.  Galangal.
That’s a start.
Peter