Does anyone know where to purchase patented registered Hybrid Tea Roses ?

What's a registered Hybrid Tea rose? You mean with a label? That won't necessarily mean much in Thailand.

I myself am a bit pedantic about knowing the correct names of the plants I have but as far as roses are concerned I don't worry too much. The ones I have bought are doing surprisingly well and only occasionally get a spraying which is what I am interested in.

If Kham Tiang market in Chiang Mai doesn't have what you're looking for I doubt you'll find it any where.

 

Hybrid Tea has the the patent number and metal registration tag on the trunk of the plant.  Not cheap but I live in Chiang Mai and have not seen anything close in quality.