Philo Judaeus De Virtutibus 156

[156] for he commands the young plants to be nursed carefully for the space of three years, while the husbandman prunes away the superfluous off-shoots, in order that the trees may not be weighed down and exhausted by them, in which case the fruit borne by them would become small and weak through insufficiency of nourishment, and he must also dig round it and clear the ground, in order that no injurious plant may grow near it, so as to hinder its growth. And he does not allow the fruit to be gathered out of season at any one’s pleasure, not only because, if that were done, it would be imperfect and produced from imperfect trees (for so also animals which are not perfect themselves cannot produce a perfect offspring), but also because the young plants themselves would be injured, and would in a manner be bowed down and kept as creepers on the earth, by being prevented from shooting up into straight and stout trunks.