Related על ראש השנה 18:1

How [one should understand]: "for tree planting"? [Answer:] No matter whether one plants, cuts down, or grafts thirty days before the beginning of the year, [this period] shall be counted to him as a year, and it is lawful to take care of it in the 7th year. [If the period] is less than that, it shall not count as a year for him, and it is forbidden to take care of it in the 7th year. And the fruits of this tree planting are forbidden until the fifteenth of the Shvat, when pertaining to the Orla provisions, as Orla, when pertaining to the fourth year provisions, as in the fourth year.