Bluebells can become invasive and too much of a good thing. The bulbs go deep down into good soil and if you want to remove them they must be dug out totally. The white bulbs throw off little bulbils and they will grow back unless you clean up the soil to at least 12 “.
After flowering the leaves of Bluebells loose the turgid nature and spread in a slimy manner over an 18″ diameter inhibiting other follow-on plants. I pull up the clumps of leaves, stalks, seedheads and all to clear the ground. They come up very easily breaking off from the bulb and leaving that for future years. If I do it early enough the bulbs will weaken and flowers be poorer next year but as you may guess I am no great lover of Bluebells except in woodland situations.
Spanish Bluebells are more invasive and are pushing our own native species out. If the flower spike is stiff and upright, flowers broadly spreading and petals usually not rolled back with clear blue Anthers you have Spanish Bluebells Hyacinthoides hispanica.
English bluebells Hyacinthoides have narrow leaves with scented flowers of straight-sided bells, petals that are rolled back and Anthers which are creamy-white.
There are also hybrids of the two key varieties and most of my Bluebells must be the Spanish variety so out they will come.
I am sticking to plant pots on the top of my ‘personhole’ covers as the link above didn’t work when I tried.