Filter problem

Hello folks!

I have a problem in applying a filter to a list in wix code.
I want to sort for only getting the plants flowering in june, for instance. When I activate the function tho, it will show me no plant at all (also hiding those flowering in june).
Can someone help me out?

My code below:
import wixData from ‘wix-data’;

$w.onReady(function () {
//TODO: write your page related code here…
});
//…filter to June
export function junebox_onclick() {
console.log(“filtering items to June”);

$w("#dataset1").setFilter( wixData.filter().contains("Flowering period", "Jun") ) 

.catch((error) => { 
	let errorMsg = error.message; 
	let code = error.code; 
} ); 

}