You can get there seeds with a trike.just tame a trike ride it and harvest bushes it's will give you a lot of seeds.then you can plant them into the crop plots and grow them in your base.

IF YOU NEED THIS IS ONLY AVAILABLE SEED GROW IN CROO PLOT AND NOTHING EASY WAY TIPS YOU NEED SEED JUST TAME MOSCHOP AND ENABLE WANDERING AND WAIT AFTER SOME TIME HE IS GIVE YOU SEED

You need to plant them from citronal seeds and grow them in crop plots. The seeds can be found by harvesting berry bushes and with luck you will find. Or have a Dino like Dire bear or trike or some kinda Herbavor that can harvest berries and you will have more than enough seeds within minutes of farming bushes.

Does anyone know where to get them in survival evolved? It would help if yeah!

I have never seen these in game. Where are they or could be found?