how to stop spiders in my house?

As an environmentalist I am against all chemical insecticides and repellents. Frankly speaking these things make me more sick than the insects. I'd rather live with them.

There may be plants in your garden that is attracting the spiders and insects. Check these out:
Fennel, angelica, coriander (cilantro), dill, and wild carrot all provide in great number the tiny flowers required by parasitic wasps. Various clovers, yarrow, and rue also attract parasitic and predatory insects. Low-growing plants, such as thyme, rosemary, or mint, provide shelter for ground beetles and other beneficial insects. Composite flowers (daisy and chamomile) and mints (spearmint, peppermint, or catnip) will attract predatory wasps, hover flies, and robber flies.

But my point here is, these insects are actually helping you to kill the pests in the garden that damages your plants. If you remove them, you may get much more insects that doesn't come into your house but eating your plants instead! People actually plant them to invite these insects to get rid of pests!

Try planting things among your flowers and trees that is naturally repelling pests. My best choices are those that I can use in my food!
Basil — Repels flies and mosquitoes.
Catnip — Deters flea beetle.
Garlic — Deters Japanese beetle.
Marigold — The workhorse of pest deterrents. Discourages Mexian bean beetles, nematodes and others.
Mint — Deters white cabbage moth.
Peppermint — Repels the white cabbage butterfly.
Rosemary — Deters cabbage moth, bean beetles and carrot fly.


Conclusion? These things won't kill all bugs as efficiently as insecticides. It only reduce the number of bugs. You'll have to weigh between the toxicity of insecticides and your tolerance to bugs. For me, it is a blessing to live in a place with a private garden in Hong Kong. Having insect companions actually tells you that the pollution isn't very bad at where you live. I don't get insects in my house except cockroaches and mosquitoes. People must have sprayed a terrible amount of insecticides in the garden around our housing estate. =.=

You can try spraying insectide on the door-frame (on the outside) and window-frames. Now there are enviromental-friendly products you can surely give them a trial. Re-spray the frames after rainstorms as these products are water soluble.

Insects are sensitive to those insectide and they will not come near to your door or windows if insectides are sprayed.