Seven ecological regions have been applied for the Plant variety testing Network in Vietnam

1. Northern mountainous and midland region, with the Northwest region (4 provinces): Lai Chau, Dien Bien, Son La and Hoa Binh; Northeast region (11 provinces): Cao Bang, Lang Son, Bac Can, Thai Nguyen, Quang Ninh, Bac Giang, Lao Cai, Yen Bai, Ha Giang, Tuyen Quang, and Phu Tho.
2. The Red River Delta: Hai Phong, Hai Duong, Bac Ninh, Hung Yen, Hanoi, Ha Tay, Thai Binh, Nam Dinh, Ha Nam, Ninh Binh, and Vinh Phuc provinces.
3. North Central region (6 provinces): Thanh Hoa, Nghe An, Ha Tinh, Quang Binh, Quang Tri and Thua Thien - Hue.
4. South Central region (8 provinces): Da Nang, Quang Nam, Quang Ngai, Binh Dinh, Phu Yen and Khanh Hoa, Ninh Thuan, Binh Thuan
5. The Central Highlands region (5 provinces): Lam Dong, Dak Nong, Dak Lak, Gia Lai and Kon Tum.
6. Southeast region (6 provinces): Dong Nai, Binh Duong, Binh Phuoc, Tay Ninh, Ho Chi Minh City, , Ba ria - Vung Tau.
7. Mekong River Delta (13 provinces): Long An, Ben Tre, Dong Thap, Soc Trang, Vinh Long, Can Tho, Hau Giang, Tien Giang, Bac Lieu, Ca Mau, Kien Giang, An Giang, Tra Vinh, Can Tho city, Hau Giang, Tien Giang, Bac Lieu, Ca Mau, Kien Giang, An Giang, and Tra Vinh.