You can uproot flax from the fields because you can use it to cover the food with flax. You can uproot the hops from the fields because you can use them to make beer. Right, for the purpose of the moed (festival).
Let's say there's a certain type of grain. It's not really sesame, but a type of item; let's call it shumshumin (sesame seeds). The dry ones are edible immediately, so they're permissible as well. So the Mishnah Berurah says, I guess they used to cover the figs and dates while they were drying in the sun. You want to cover them so the dew in the morning doesn't go on them, so they take flight. You want to cover the flax and the fruits. And even then, you can only uproot as much as you need to cover the fruits. You can't just uproot as much as you want. You're using it for that purpose.
Which means, let's say, the ladies used to use it to wash themselves with the flax. They would soak it in water and smoothen their flesh with it, and it would cause a brightness in their appearance. You can uproot the pishtan (flax) for this. The thing is, you only have to cut the top of the pishtan, because that's, I guess, the part they use for chafifah (scrubbing). Which means you're going to have to start cutting the top parts off. It's a burden a little bit. You can just pull it out the regular way and use the top parts of the pishtan for the chafifah. But again, you can only take as much as is going to be needed.
For example, the hops. You can use them for the beer, which means they would put hops in the beer to give it a little sharpness. Only if he has that intention. Again, only if you're using it for that purpose. And you can only take enough for the purpose that is needed. And for all of our hops. We don't have our own hops.
It's not sesame that we're familiar with. That's a regular food. It's a type of seed that they make from the seeds of the seeds. They press these seeds of this type of seed and make oil out of it, or fry it with honey, and they're used for eating. And they're not used for all of this. They're used for the time they're dry. But you can only use them when they're dry. But in the future, you need to heat them, and you have to dry them out. They're not going to be ready until afterwards.
So, if you want to use dry sesame to eat it with this olive, with the dvash (honey), or if you want to press it to get the oil, you're allowed to cut as much as you need for that purpose. Which means when you're in the field, you just cut the sesame without looking which ones are dry and which ones are moist. And then you take the dry ones and use them for the oil, for eating purposes.