Olive and coffee plant - where to buy et al

Cheers all gardeners!

To say that I am a beginner to this whole gardening would be an overstatement. I became very fascinated by the idea of being able to use the seeds from fruits and vegetables one buys at the grocery store/farmer's market to grow a completely new plant. I've grown avocado and lemon plants (I've spent hours peeling actual lemon seeds), fermenting seeds from cherry tomatoes, dissected bananas (for hours... it was a wasted time), tried to stratify blackberry and apple seeds in my fridge for months (I even tried "breaking stratification" of blackberry seeds by mixing some in a solution of chlorine, and some in a solution of vinegar - needles to say it didn't work). Some plants grew some didn't but none had fruits (i had the avocado plant for 4-5years) and the whole purpose of this endeavor was... to produce food from "nothing"). Clearly I learned the hard way that the fruits and veggies one buys at a store are cultivars and can not (in most cases be grown from seeds) but are instead propagated through cuttings et al. (What is the most efficient way of fining out if a plant is a cultivar - are all fruits and veggies one buys cultivars (i hope I'm using this word correctly)?
Now, I always wanted to have a small olive and a coffee tree growing in a pot (and bearing fruit). I've researched a lot of stores and I'm having a hard time picking one place to order from - it rarely really says on the store's website that "this plant will grow you fruits" and very few places in general sell olive plants not to mention coffee plants. I was thinking Manzanillo (self pollinating) olive would work. Question is: do i even have to worry about making sure that the olive tree i am buying was propagated through cuttings and not grown from seeds or are olives one of those plants that will bear fruit no matter what (how do I find that out for other plants - please don't respond "google it"? how does it work for coffee plants (coffea arabica)? There are for example plenty of people selling coffee and olive tree seeds, but will those grow and become fruit-bearing plants?

I found a store that www.logees.com that sells both plants but not all comments on davesgarden.com relating to that store were positive - but I guess that's normal, right? Any other places you would suggest where i can buy those plants? preferably both at once to save on the shipping? I saw a lot of people on around here willing to trade the olive trees but I have nothing to trade with.

Thank you everybody in advance for answering and I apologize for any material errors in the above text.


PS.
What are other diy-ways of breaking stratification?

Did you check to see how many years it takes to mature a tree enough for it to produce fruits? I think avocado is maybe 8 to 20 years, and if it were from a graft when it does bear fruit- theres no telling which fruit you get. Olive is 5? years? These are long term investments not overnite production

Olive trees have been grown for thousands of years. Almost as long as agriculture has been known.
Over the years olives have been developed for oil, or for eating.

All of them are large trees, they grow well in a warm climate, and need very good drainage, and minimal water. They are great in Mediterranean climates.

The smallest varieties have been developed as ornamental shrubs and bear few, if any fruit, and it is rather dry compared to a commercial olive. The varieties for eating are usually grafted. That is, a twig from the desirable fruiting variety is grafted onto a variety with a strong root system.

So... Olives:
If you want to grow a tree that produces fruit, move to a Mediterranean climate and buy a started plant of one of the named varieties.

Coffee: Uh... I have one of the house plants... but I do not think they will actually become productive grown in the home. They are a tropical plant. Perhaps you could grow it in a large greenhouse- I think they are large shrubs to small trees when they are grown for coffee production. If I remember correctly there are 2 species and many varieties grown for coffee. Probably cutting grown.

Thank you for both responses.

I am well aware that this is not an overnight endeavor but rather a decade-long pursuit. I just don't want to wait 20years just to find out that the plant I've been caring for is incapable of bearing fruit.
While moving to Mediterranean region definitely crossed my mind I will have to put that idea on a back-burner.
I am by no mean trying to start a commercial production out of one pot;P I just wanted to find out that if I provide these plants with artificial environment resembling their natural habitat, will they grow A fruit . I guess it all comes down to: is any plant grown from seed (or otherwise) capable (under optimal circumstances) of producing fruit(s) (it doesn't have to be a tasty fruit)?

Well, as you have found out so far, many of the cultivated varieties of fruits and vegetables have been selectively bred, or vegetatively propagated to develop size, flavor, color, keeping quality, firmness for harvest by machine followed by packing and shipping, disease resistance and other desirable traits.

For plants that bear decent fruit or vegetables without such careful attention look to open pollinated varieties, Seeds of Change, and similar organizations. Many heirloom varieties are of this sort.

If you plant seeds that you find in most store bought fruits and vegetables they will not reproduce the same variety. Perhaps something better, perhaps not. And remember that 'better' is a relative term. If your area has a certain pest or disease, and the new seedling is resistant to it, then this is better. But this improvement would not significant in an area without that pest or disease. If you are looking for an apple that is high in pectin, and the seedling bears an apple that is low in pectin, but tasty and good for fresh eating, is that better?

If you go back far enough in the history of any crop you will come to a time when that crop was grown from seed. But the fruit may have been small, not very good, or the plant too devastated by pests or disease to produce a good crop. So, technically almost all crops can be grown from seed, the question is whether it will be something worthwhile.

If you want to grow a plant out of the range where it can be grown then you will need to provide what it needs. In the case of coffee and olive, grown in areas with too-cold winters, a greenhouse will be needed, large enough to house a large tree. Olives can be pruned to keep them somewhat smaller, and they are slow growing, but eventually they get big.

I do not specifically know which varieties of olive or coffee are grown from seed.

Here in UK, most DIY stores who have a garden centre area have OLIVE 's as either standards or open tree's, surpising they are NOT expensive as any other fruiting tree's, mine was a birthday gift from my daughter and have had it survive the last 5 years.

I need to bring it inside, into a cold greenhouse, it needs to be frost free over winter BUT not kept heated like inside a central heated room where the air is far too dry, I only water it just enough to keep it from dying and come spring, I place it outside in day time and back inside at night, do this for a few weeks till night temps are OK, start watering when you see new growth, mine os lolly-pop shape so you need to prune it in spring.
the fruit appears alternate years, one year the flowers, next year the flowers grow into the fruit. I don't like Olives so dont know what they taste like BUT visitors have enjoyed them OR pretended to LOL.

Cant give any idea re Coffee, I imagine way tooooo cold here in UK but no doubt will be proved wrong LOL.

Good luck and kindest Regards.
WeeNel.