Bin your pesticides
If you can, stop using pesticides. A lot of chemicals in pesticides are damaging to to bees and other wildlife, so try and find a safer alternative.
Go the extra mile and see if your local council use pesticides in your area and try to reduce or stop the use of it.
Rethink your take on lawn weeds. Dandelions are excellent bee plants, providing vital pollen early in the season. White clover is a honeybee magnet, while the longer tongued bumblebees prefer red clover. Let the grass grow longer and allow the lawn to flower.
Try your best to buy organic plants/ seeds/ bulbs that are all pesticide free, and try to grow them without using insecticides. Some plants can be hard to find, but they are becoming more readily available now people are opting for them. If you need to find a supplier take a look here soilassociation.org.
Give them something to drink
Bees evaporate water to cool their hives meaning they need to keep themselves hydrated. Puddles and other sources are too deep and the bees can drown easily, the best way to help them is a water bowl full of glass pebbles, stones or marbles to give them a stable surfaces to drink on