Seed hasn’t sprouted

Sometimes the seeds are too old and you need to give them more time, and sometimes the seeds don't germinate at all.We generally do not recommend soaking seeds in water for more than 48 hours.Sometimes because the seed is too old, his shell is very hard, the water is difficult to moisten and soften this shell, you can try to carefully squeeze the ridge of the seed, let his ridge slightly cracked, and then continue to put it in a wet tissue to germinate