Thanks for the complement. I did not do much reno at my house. Malu to show here la. 
No need to do divider. Your yellow and pink area should not have grass, just soil and cover with the coconut sleeves underneath your flowers. If you want a nice border between grass and flower, you can put some pebble in between them. After your grass grow strong, you can use a knife to cut a straight line between your green & pink and yellow & green.

I would like to dig away 6 inches of grass/soil in my house, can I know where can I order this "thing"? what is it called and what's the market price to order one and have grass/soil removed? dig soil labor fee and removal fee?

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You can make divider and hide away from sight and remove whenever necessary in future.

Using tiles, wall tile is thinner and easier to cut. Use a glass cutter cut 3 to 4 inches wide (as depth) many pieces and plant into the line where you want to divide. With the tiles 3-4 inches underground, the grass root will not able to spread underground to the other side. The tile is buried underground and just a little (few mm) of its top expose above ground. As the grass grow you can pull up a bit so that the top grass will not cross to the other side too.

May I know what type of grass is this?

what is the best way to maintain Philippines grass? my area of grass has shades so not much sunlight.

Thanks for the info. May u know how much does this type of grass cost?

Yes its true..same happen to me as well...

Guys, I'm planning to plant Philippine grass for my small garden, my contractor is telling me to put sand and make it compact before laying the glass instead of soil. Just want to confirm, is this the correct way?

Recently I see a lot of weed-looking grass growing on my japanese grass, can someone tell me whether those are grown from Japanese grass or from other type of grass that I should remove?

If need to remove those grass, what can I do to remove them?

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