Hybrids are crossed to maximze flavor, size or disease resistance or all. These would naturally cross pollinate but the seeds would not produce the same variety.
The only seed I stay away from would be any GMO product. A great example would be the Monsanto GMO corn. It is injected some how with glyphosate so it is part of its jeans. Therefore it becomes naturally immnue to it. That means they can spray the corn with glyphosate which is basically roundup with no ill effects to the corn. Roundup is toxic and I suggest everyone stay away form it at all cost. If you need to use it for what ever reason protect yourself with appropriate clothing and breathing equipment. In the US their is or was legislation to protect Monsanto from any harm because of this. I believe but not sure it was taken away.
Another variation would be interspecifics. An example would be pluots/plumcots, apruims, nectacots and pluerry. The list goes on and on. I actually started growing these. Any pollin can possibly pollinate anything. The problem is the flower will eventually reject the pollin if not compatible and die. Interspecifics are cross pollinated in a lab. Once pollinated they somehow keep the flower from dying which creates a cross of the fruit. There is a lot more to the story but that is how I basically interpret it.
MOD
