Cats by nature love to dig and often cause serious problems at home. If it is impossible to isolate the flowers and the cat from each other, you will have to start raising the cat and there are several proven tricks for this.
First of all, just in case, make the plants inaccessible to the cat with which it can be poisoned. Dangerous dieffenbachia, philodendron, hydrangea, ficus, euphorbia and many others.
After that, look carefully at the windowsills to see if there is a place for the cat. Maybe she crawls into flowers just to look out the window. Free up a small space next to the most affected flowers and the problem may go away. If your cat eats flowers, try planting a special herb for her. If trying to use the potty as a toilet, change the litter so the kitty can rummage through her litter box.
If all this does not help, you can proceed to the standard methods of training - they saw that the cat is near the flowers, threateningly said "No," and threatened him with a finger. Doesn't obey - a light slap on the pope, you can use a newspaper or spray from a spray bottle (one of the most effective ways of education).
Try to scare off with smells - you can decompose citrus peels in pots (not all cats do not like this smell) or smear pots with essential oil with a pungent smell or asterisk balm. The flowers and the ground themselves can be treated with an infusion of wormwood or pepper, it will not harm the flowers or the cat. Pet stores sell special sprays, but not all of these products are effective and safe.
Additionally, you can lay out the foil, stick adhesive tape, stick toothpicks into the ground. It is impossible to guess which method will work on your pet.
If all else fails, you can use a covering material and cover the ground or put a mini-fence on the windowsill.