Chives are a great source of autumn nectar for bees and butterflies. Cut them back after they flower in the spring and they will flower again in August/September. They look great in a flower bed with other globular flowered plants of about the same hight. I like to mix them with globe flowers.
You can buy chives cheaply as potted herbs in most supermarkets and split the clump to make 3-4 plants. As an added bonus they are great cooking herb and are very hardy and easy to grow.
Found wandering on our drive this weird looking caterpillar was looking for somewhere to pupate. It will turn into a beautiful green and pink moth. To encourage moths and butterflies in your garden you need to provide good nectar plants and food plants for caterpillars. Butterflies also benefit from stones in sunny spots to bask on. Honeysuckle is good nectar plant for hawkmoths, it is pale in colour and scented at night so they can easily find it. It also provides large volumes of a weaker (less sticky) nectar than many bee pollinated flowers which means the nectar can be sucked up quickly while the moth hovers to feed. The caterpillars feed on a range of flowers including common garden plants like Fuchsias.
Even small gardens can support a wide array of species. Why not turn a part of your lawn in to a short but colourful flower meadow for bees and butterflies or add a raised pond to attract dragonflies and grow water lilies?