There are a few different ways to answer this question, as there are many crops that take a long time to grow. For example, trees can take years or even decades to mature, while other plants may only take a few months. Here are some examples of crops that take a long time to grow:
Trees: Many types of trees can take 20 years or more to reach maturity. This includes popular varieties such as oak and maple. Some fruit trees may take even longer, with some citrus varieties taking up to 30 years before they start bearing fruit.
Vines: Vines such as grapevines can also be quite slow-growing. It can takes years for them to reach full size and begin producing grapes in large quantities. Other vines, such as kiwifruit vines, may also take several years before they start bearing fruit.
Flowers: Some flowers, such as roses, can take two or three years from planting until they first bloom. Others, such as lilies, may onlytake a year or so before they flower for the first time.