Cat grass can be eaten around the seventh day after planting. The specific needs will depend on the growth of the cat grass. After the cat grass sprouts and grows, when the grass grows to 7~8cm, it can be eaten by cats. This time is usually about a week. At this time, the grass is the most tender, and after gnawing it, it can grow another crop. After that, the grass becomes yellow and old, and the cat doesn't like to eat it. When you find that the cat grass has become withered and yellow, you can prepare to plant another batch of cat grass. It is generally planted in spring and autumn. Cats shed more hair at this time, and eating cat grass helps to shed hair.

Notes on feeding cat grass:

1. Do not feed cat grass to cats that are too young. Cats do not spit out hairballs as soon as they are born. Generally speaking, cats do not learn how to spit out hairballs until eight months old. At this time, it is more appropriate to buy hair removal cream for cats.

2. Do not feed cats too much cat grass. An appropriate amount of cat grass can help cats digest food and avoid constipation, but excessive consumption of cat grass will make it difficult for cats to digest food. In serious cases, it may cause damage to the cat's stomach.

3. Avoid extracting juice from cat grass. The most important part of cat grass is crude plant fiber, and its most important function is to help cats expel hair balls. If cat grass juice is used instead of cat grass, it will not be able to help the cat expel the accumulated hair balls, which will have long-term effects on the cat's gastrointestinal tract.

4. Do not feed cooked cat grass. The most suitable part of cat grass to eat is the fresh young leaves. The efficacy of dry and yellow cat grass is greatly reduced, and it is not easy to digest, but it will be harmful to the cat's gastrointestinal condition.