Generally speaking, blanch asparagus for 2-10 minutes.

1. If the stems of asparagus are thin, the blanching time is about 2 minutes.

2. For medium-sized asparagus, blanch it for about 3 minutes.

3. For large asparagus or whole asparagus, the blanching time may take 4 minutes or longer.

4. For large asparagus or whole asparagus, the blanching time may take 4 minutes or longer.

5. If the asparagus is blanched whole in the pot, it will take longer, and it may take 7-10 minutes to cook. During the blanching process, you can add a little salt and cooking oil to keep the asparagus bright green and crisp. After blanching, it is recommended to run the asparagus through cold water, then remove it and drain the water. This can maintain the taste and color of the asparagus.