If growing your artichoke as a perrenial, in warmer climates that is, they are best started in the Fall in my opinion, although some gardeners would beg to differ. Grown as an annual in colder regions they can be started indoors in December Through February. To plant outdoors in early spring. Mild summers where the prevailing temps stay below the mid 80s [F]
Plants grown from seed indoors can be transplanted outdoors in early spring, after the soil has warmed up to about 50 degrees F. Asparagus started from crowns should be done in the spring, there is no advantage to planting the crowns earlier in cold, wet soils.
Plant the seeds outdoors only when chances of frost are over and the ground is warm. Soil temperature should be 65-85 degrees F. In most areas it's a good idea get a head start on the season by starting seeds indoors 4 to 6 weeks before the last spring frost.
Start seeds early indoors in peat pots or cell packs. Eggplants need heat, some veggies will tolerate mild frost, eggplants does not. It is a very tender plant that requires a long, warm season for successful production. Be sure that all danger of frost has passed before planting outdoors in the spring.
There are over 50 types of Lemon grass with similar qualities and characteristics. Seed can be started indoors in winter for spring transplant. Be sure to check hardiness zones for your region
Onions are most commonly grown from sets, immature bulbs. They can also be started from seed. Onion Seeds can be sown in the garden in the midfall to over winter and produce a crop next season. Planting them directly in the soil in the spring is only advisable in the best of climates, otherwise they should be seeded into cell pots or a suitable container for transplant into the garden in spring. December through February is fine for starting onion seeds indoors.
Peppers are best started indoors in late winter or early spring. Start from seeds in peat pots or cell packs and then transplant into the garden when night-time temperatures in your region are consistently above 50 degrees.
January or Febuary are good times to start rosemary. Rosemary is actually an evergreen that can be grown outdoors successfully in Zones 8 and 9. It is a woody-stemmed plant with needles similar to pine needle but they're leaves. Rosemary can also be grown as a container plant, over wintered indoors, in other zones.
Sage can be started earlier or later than January, but January is just swell for starting from seed. It dries out quickly, so a well drained light soil is necessary. In USDA zones 5 to 8, sage can be grown outdoors as a perennial. In more humid regions it is usually grown as an annual, it does not tolerate the dog days of summer very well. Set out transplants in spring or fall in some regions.
Growing strawberries from seed is a challenge, a real challenge. If you've never grown strawberries before it is advisable to start with already established plants purchased from a reputable seller. If you are up to a challenge and want to try and produce some strawberry plants from seed go for it See: Strawberries from Seed
Sweet peas and regular peas can be sown in Autumn for a dazzling early floral display and edible harvest come spring. They can also be planted in January or February. It's not advisable to start peas from seeds indoors, they mature too quickly at times and also do not always transplant well.
It's time for Thyme. It can be started from seed indoors in pots or flats December through January is dandy. Bush thymes frequently reseed themselves freely once in the garden, so there will be constant regeneration.
January or Febuary is a good time to start tomato plants indoors from seed. Most gardeners buy seedlings for transplant, which works just swell. Starting your own tomato plants from seed involves a tad more diligence, but is more cost effective and in my opinion more rewarding. See: Germinating Tomatoes - Growing Tomato Plants from Seed