1) Build an indoor transplant box
It's expensive to rebuild a garden and it's also expensive having to buy little packets of herbs on an as need basis. Some plants can be transplanted inside over the winter and then planted back out in the spring. All you need is a window with a decent amount of light and a good ledge. Transplant your herbs into individual pots and keep them watered over the winter. Obviously many plants might be too large, so read up online on how to cut off transplant pieces of the plant to move into more manageable containers. Herbs that keep well over the winter include chive, rosemary and sage.
2) Dry out herbs for the winter
Don't waste money on buying dry herbs if you have the fresh at home. All you need is a little cooking string and a dry space to hang them in. Basil, parsley, oregano and dill are all very easy to dry this way. Cilantro when it turns to seed produces coriander which can be collected all around the bottom of the plant. Just keep an eye on them every few days. Once dried, chop or crumble them and keep in a well sealed container. They will be much more potent then the herbs you have been keeping for years in the cupboard.
3) Make herb butter
If you really want to impress your guests, take your favourite herbs and mix them with butter. Take about 1 tbsp of herbs for every 3/4 cup of butter. Blend and form a ball. Wrap in plastic wrap and keep in the fridge until needed. Keep them in the freezer for even longer storage.
4) Make herb oils
Flavoured oils can be an easy addition to a salad dressing or stir fry. Just take a neutral oil like grape seed, canola, sun flower or safflower. Place in a dark bottle with a large bunch of the desired herb. Let sit for at least 2 weeks before use. Some great combinations: basil and oregano for an Italian flavour or thyme and rosemary for a great flavour to mix with basaltic vinegar as an easy dressing.
5) Make herb cubes
Take the herbs that are starting to go and put them in the food processor with some oil. Blend well and then pour the mixture into ice cube trays. Freeze for easy to pop out flavour cubes to add to your next dinner. Still tastes fresh with a lot less prep.
6) Make herb bouquets
Some herbs can be purchased with the roots still intact. These ones are best kept on the counter in water like you would flowers. They will keep much longer this way than in the fridge.
7) Research your herbs
Different herbs need different care. Some are hearty and will last a long time cut off in the fridge like sage while others need to be kept out to avoid rotting. Do your research before to save yourself from wasting more than you bargained for.