What can be better on a cold, grey, winter day than stepping into a greenhouse bursting with color from exotic plants? Longwood Gardens in Kennett Square has an annual Orchid Extravaganza from January through March, with hundreds of orchids on display. You will find everything from more common plants such as Phalaenopsis, to rare gems such Fredclarkeara After Dark 'SVO Black Pearl', in many colors and creative displays.