Flowering Pots In Betta Tank

[bluesword23516]

Recently I had a flowering pot that was outside and got knocked over by the wind and is now broken. I wanted to put this in my betta's tank as some hiding spots and some cool decorations for her. It has had soil in it, but none with fertilizer that I know of. 
 
How can I clean this to make sure there isn't any fertilizer left in it and make it safe for my betta? 

 

[NickAu]

Question
What sort of plant is it? Will this plant grow in or under water?
I once got a verigated plant ( Had no idea as it was in water at LFS ) and it died in about 3 weeks making a awfull mess in the tank.

 

[RyanTheFishGuy64]

If you clean the pot with a 1:3 water:vineager solution, it's should be clean and ready to go!

 

[bluesword23516]

Ok thanks!

 

[NickAu]

 
If you clean the pot with a 1:3 water:vineager solution, it's should be clean and ready to go!

What about the roots of the plant? Cleaning the pot is only half a job, What type of soil is in the pot.

 

[Alasse]

 

 
If you clean the pot with a 1:3 water:vineager solution, it's should be clean and ready to go!

What about the roots of the plant? Cleaning the pot is only half a job, What type of soil is in the pot.
 

Pretty sure the OP is putting the pot into the water not the plant that was in the pot