I live in Scotland, and have a north facing front garden and a south facing back garden. It’s never been a problem, and I grow a large selection of plants in the north facing bit, including lavender, roses, azaleas, rhododendrons, aquilegia, hostas, brunnera, holly, peonies, bluebells, scilla, tulips, snowdrops, daffodils, forsythia, weigelia, mock orange, berberis, penstemons, scabious, lilies of the valley, foxgloves, ferns, oregano, pieris, heathers, euonymus, cinneraria, wallflowers, ivy, nasturtiums, heuchera, spirea, cyclamen and snapdragons! My only failure was a dicentra, which died off after about three years, and I had to remove a 40 year old flowering cherry tree after it rooted into my main sewer.