Here are some plants which can be seen at the garden during springtime:
Plants of Interest
Springtime

Anemone blanda

Snowdrops (Galanthus)

Helleborus x hybrida Lenten Rose

Camellia

Fritillaria meleagris

Rhododendron ‘Half Dam Lem’
Summer
Here are some plants which can be seen at the garden during the Summer months:

Cardoon (Cynara cardunculus)

Sunflower (Helianthus)

Agapanthus ‘Royal Blue’

Allium

Water Lily (Nymphaea)

Rudbeckia Goldsturm
Autumn / Winter
Here are some plants which can be seen at the garden during the Autumn and Winter months:

Fly Agaric

Schizostylis (Kaffir Lily)

Aster novi-belgii ‘Percy Thrower’

Anemone x hybrida ‘Honorine

Garrya eliptica

Hamemelis mollis