or even flowers? I realize I wont get fruits as there isnt the female/male thing.
from experimenting I know lemon seeds arent worth anythin. unlike avocado or squash which are growing nicely.
please give me detalied list or link and somme advice thanks

you can plant anything that has seeds, including lemons

cut the top off a pineapple and put in a pot. i've done this and now have a really nice houseplant.

Parsley , carrot, celery, onion, chives, salsify, radish, lettuce all will give a nice flower if left to grow on instead of harvesting them Some are biennial, that is they grow in the first year and flower to produce seed in the next year. Another nice flower is from the fennel plant and the rhubarb. And of course, there is the ornamental cabbage. Asparagus, when it is allowed to shoot, also has lovely leaves which can be used in flower arrangements.

I always just go and buy seeds when I want to plant something. You can get a pack of seeds for like $1.
I know you can grow potatoes by planting ( I think ) the actual potato after it has grown "eyes" on it.
If you have birds or feed wild birds...plant the left over seed that they don't eat, you would be surprised at what comes up. My mom has two birds and when she changes thier seed, she just throws it in the field next to her house and she gets all kinds of unknown stuff growing there.

Sorry I couldn't be much help, I'm not much of a gardener.