Can you go back to the source of the plant and find out what nursery produced them? You are in Thailand, I see.

they can't explain to me. i'm not a thai, so can't talk ...lol..

I don't know this plant but I Googled and found Ficus rotundifolia 'Green ISland'. I can't tell you what plant has provided the trunk for your standard tree but basic care for any grafted plant would be to remove any shoots coming from anywhere on the trunk except the top.

As to propagation, most Ficus are easy to increase by cuttings (Google for instructions) but be aware that any offspring will follow the low spreading form of Ficus rotundifolia and will not be standards.

The trunks actually look very artificial. If you examine the greenery at the top is it really growing from the trunk or has it just been attached in some way such as a moss ball or something? And are the trunks really growing in that mix? They look hammered in ;-)

Here is a link that might be useful: Ficus rotundifolia 'Green Island

thks for the link.

attached are 2 pics. they're not hammered in. it's growing there.

here's the second plant...

guess they used another trunk and attached it there and let it grow.

what do you call it ?
layer ?

thks.

OK, so they are grafted onto a separate trunk. Maybe another Ficus species.

here's the second plant...

guess they used another trunk and attached it there and let it grow.

what do you call it ?
layer ?

thks.

{{!gwi}}

No, not a layer. It's a graft as you surmised in your original message.