They will all fruit when old enough and the fruit produced might turn out to be perfectly acceptable. The problem is that you just won't know what the fruit is going to be like until fruiting starts, so many years down the road - there isn't the character predictability of planting instead grafted clones of named selections. And seedlings don't have the sexual maturity of clones, in which the maturity of the scion source plants carries over to the grafted combinations. So you have to wait for seedlings to become sexually mature, before you find out what the fruit of each is like.

I have Fukushu and Meiwa kumquat trees that fruit in a reasonable amount of time with excellent tasting fruit. My peaches and sour cherry trees are also from seed all giiving excelent tasting fruit.. I am grafting pear scions to seed grown pears from bradfored pair tree fruits with great success.. I have a seed grown american persimmon tree. Apples pears sweet cherries are worthless from seed most of the time. Peaches grow verry fast and produce in the 3rd or 4th year. Sour cherries and kumquat are small fruits and produce quickly.. Go for it.

Steve

It depends on what specific fruit you are talking about.

Can you tell us what you are interested in growing? I assume since you posted on Citrus forum, you might be interested in growing citrus from seed?

im not too picky- whatever would grow best (and I'm able to get my hands on). would you recommend any, specifically?

Well, some citrus varieties that have a shorter juvenile phase might include calamondin, key lime, and kumquat. 3 to 5 years from seed to blooming maybe, depending on your growing season. Lemons and mandarins a little longer. Oranges, grapefruit and pomelo 15 to 20 years.

Key lime grows true to type, within 3 years...

start now, not later.

Depends on your expectations. The very best hybrid fruit were grown from seed. One example is the Granny Smith Apple. Not all seed will produce a perfect great tasting fruit, but they will, in time, produce fruit. Those fruit can be used in various recipes, instead of eating them fresh. If you want a sure thing buy grafted (or graft them yourself). If you like to experiment plant the seed. Either way, best of luck to you!