Sheviis 2:9-10

Sheviis 2:9

Seedless onions and Egyptian beans that were not irrigated for thirty days before Rosh Hashana are tithed as produce of the sixth year and they are permitted in the seventh (the sabbatical). If they were watered within thirty days of Rosh Hashana, they are forbidden in the seventh year and tithed in the eighth. If they grow in a field that is watered by rain rather than irrigation, Rabbi Meir says the rule is based on not being watered for two periods of rain before Rosh Hashana; the Sages say three periods.

Sheviis 2:10

If gourds were left in the ground to produce seed, they may be kept in the sabbatical year if they hardened and became unfit for human consumption before Rosh Hashana. If this is not the case, they must be removed for the sabbatical and their leaves (which would still be fit to eat) are prohibited in the sabbatical year. Rabbi Shimon permits one to water a field of widely-spaced trees but Rabbi Eliezer ben Yaakov prohibits this. One may saturate a rice field in the sabbatical year but Rabbi Shimon says that one may not trim off the leaves.