Roxanne, Grow true means, say you sow a certain citrus seed..grow true means, the seed will grow and seedling will look like the parent..if it doesn't grow true, then you'll grow a plant that doesn't resemble the parent tree. Hope that explains it..Toni

Toni is right, but let me be more accurate.

The seedling will have the same DNA as the parent (referred to as nucellar seedling), and oftentimes will not look like its parent during the juvenile or young stage. At that stage, the citrus, even though it has the same DNA as the parent, in most cultivars, the one grown from seed will be thornier and vegetative for a long period and will ultimately bloom. So if the parent is grafted, the mature tree sizes could be vastly different depending on the cultivar.

o.k. If the seedling does not have the same DNA, would the fruit still taste good or is there no way of knowing?

It is kind of a crap shoot. The fruit could be identical, better or worse. You could create a new variety or something that should be only used for target practice. Actually, that is part of the fun in growing from seed. Remember though, Citrus from seed can take 4-10 years to produce.
Darren

Growing citrus trees from seeds can be ultimate experience and fun. I started growing quite a few various citrus trees from the pip and most important thing is that you slowly gain as much knowledge as possible from other people here with great experience.
Give your seedlings optimal conditions and grow at least 3 trees that come from the same type of citrus so that you have higher chance of getting a nice and productive citrus tree in about 4-6 years [under optimal conditions]. If they prove to have a bad fruit taste or no fruit at all, you can always graft your trees and resolve that problem for good.
There is no better feeling watching your seedlings grow into beautiful, vigorous trees, a product of your love, care and connection with your tree from their very begining. Have fun. Anton

Almost all citrus come true from seed, meaning the fruit will be identical to the parent tree(google polyembryony). The tree will be thorny and large but the seeds have not been produced from fertilization, they are clones of the parent. The few that don't come true from seed are temple, clementine and pummelo and a very FEW others. The few that don't are used to produce intentional hybrids. In fact it is nearly impossible to produce citrus hybrids with 99% of citrus and 99% don't need to be pollinated either to bear fruit. A few that need pollinization are orlando and minneola tangelo.

Here is a link that might be useful: mrtexas