Posted: 15/02/2015 at 10:53
Those laydybirds also eat the native ladybirds which is not so good.
It's not quite the same as introducing plants from elsewhere that provide food and/or shelter for native fauna as do many introduced garden plants. The problems with plants come when they invade countryside like Himalayan balsam or Japanese kntweed or those big purple rhododendrons and assorted aquatic plants which then squeeze out native plants and the associated fauna that feeds or shelters in them.
A completely native garden in my area wuld be full of couch grass, creeping buttercup, thistles, dock, nettles, marsh garss, ground ivy, horsetail with maybe willows, hawthorn and hazel. Deadly boring and not exactly bee friendly.
As it is, I have a huge range of bees and other insects and lots of birds because I grow a wide range of plants which flower at various times of the year thus providing nectar for insects and colour for me and a happy buzz of activity in all but the coldest months when the garden is animated by all the birds that visit my feeders filled with non native peanuts and seed mixes.