Getting plants from lemon seeds is possible and also quite simple. Here is the procedure to follow.

Very often we buy seedlings in nurseries that we could germinate ourselves in a very simple way. It will surely take some time before the seeds germinate equal to the purchased plant, but the satisfaction will surely be great. Here is an example of how to germinate lemon seeds.
Grow plants from lemon seeds.
As a child, any of us at least once tried to grow seedlings from seeds taken directly from the fruit, perhaps even with good results. Very often, however, some seeds have never germinated, this is because it is not always enough to throw them into the ground and cover them.
In the case of lemon, as well as for all citrus fruits, it is very easy to get seedlings. What you will need is obviously a lemon from which to take the seeds.

The first thing to do is what you need to pay more attention to. In fact, you will have to cut the lemon into two parts without cutting the seeds . Most lemon seeds are concentrated in the middle of the fruit. All you need to do is cut a quarter of a lemon to avoid them, even if someone might escape.
Then take a bowl and squeeze both parts of the lemon well to get all the juice and seeds out . When most of it is free of juice, you can cut it open with a knife and remove the other seeds attached to the pulp. With the help of a strainer, separate the juice from the seeds and place the latter on a sheet of absorbent kitchen paper. Let the seeds air dry completely and make sure they are firm once dry. Now you will have obtained your seeds, but this is just the first small step.
How to germinate seeds
For faster germination, the next step is to “peel” the lemon seeds. With tweezers you will have to remove the layer of film that covers the seed, which acts as a shell and slows its growth. Once this is done you will need a glass of water, a sheet of absorbent paper and aluminum foil.

Take the sheet of absorbent paper, fold it over itself and immerse it in the water and then wring it out so that it is moist and not soaked . Then open the sheet of paper again and arrange the seeds well spaced on one half. Fold the napkin to cover the seeds and then fold it in on itself. Take the aluminum foil and fold it over the paper towels. You will have created a germination chamber for your seeds . Now you just have to wait 2 or 3 weeks, leaving the seeds indoors in a dry and warm place.
After three weeks, open your packaging and you should find the seeds of the sprouted lemons. At this point all that’s left is to plant them. Prepare a pot with universal substrate and moisten the soil well until the water comes out of the drainage holes under the pot. With the help of a toothpick, create holes that will house your seeds. Then place the sprouts inside the holes, taking care to accommodate the root well at the bottom and burying the seed, then cover them well.

Once this is done, all you need to do is keep the vase at home until the leaves start to grow . The pot should not be in direct contact with sunlight, which could burn the sprouts, but should still be placed in a bright place, possibly near a window.
Within a month you will have small lemon plants and you can decide whether to divide them and put one in each pot, or grow them together.