Firstly, if this has already been covered I apologies. Doing a quick search I could not find any articles that covered this off. (I did not check all of the hundreds of post :-) )
Say you have grown some tomatoes, and one particular one is more vigorous than the others or has larger fruit or is more prolific; well you can propagate it from cuttings.
Cut is off close to the main stem (leaving the leaf as we do not need it).
Trim most of the leaves to prevent water loss (I left an extra leaf on there as it is winter and there is less sun and more water, in dry summer conditions I would have removed an extra leaf). I left my secateurs there for scale, however I usually use about a 30 cm lateral and I trim the bottom 20 cm.
I then use a (bamboo) stick (or anything else you have handy) to make a hole in the soil (I like to use round sticks as opposed to stakes as there will be better contact between the soil and the cutting). I make sure it is deep enough for the cutting and then I insert the cutting (do not force it in as it can break the cutting). Using the same stick, I push down next to the cutting to make sure there is good contact between soil and cutting. I then water it in.
These are 2-3 week old cuttings (in the 4 corners of the square). As you can see you are saving a lot of growing time as compared to growing from seeds. I will post a more recent picture as these 4 have really taken off as has the example cutting above.
I suspect you can keep this going from generation to generation, I think I got up to generation 3 when I first tried.
(I have not looked into what other plants this can be done with, however I suspect they will have to be part of the nightshade family)
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