Growing flowers from seed is the cheapest and most rewarding way to fill your garden, balcony and home with colour from spring right through autumn. A single packet gives you far more plants than buying trays, plus a much wider choice of varieties. This guide covers everything a beginner needs: what to buy, when and how to sow, which flowers to start with, and how to keep your seedlings thriving.
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Why grow flowers from seed?
Three good reasons. It is cheaper — one packet grows dozens of plants for a fraction of the price of garden-centre trays. It gives you more choice — hundreds of varieties you will rarely find as ready-grown plants. And it gives you control — sow chemical-free and pick exactly the colours, heights and flowering times you want. Browse the full range of flower seeds to see what is possible.
What you will need
- Flower seeds (start with the easy ones below)
- Small pots or a seed tray with drainage
- Fresh, peat-free seed compost
- A bright windowsill or a propagator
- A fine mist sprayer or a gentle watering can
Every SeedsChoice packet lists the botanical name, sowing period and germination time, so you always know what to expect.
How to sow flower seeds, step by step
- Sow thinly from March
- Cover lightly some need light
- Warm & bright 15–20°C
- Germinate 7–21 days
- Prick out to pots
- Harden off & plant out
The basics rarely change. Sow most annual flowers — such as sunflower (Helianthus annuus), cosmos (Cosmos bipinnatus) and pot marigold (Calendula officinalis) — indoors from March, or direct outdoors after the last frost. Hardy perennial flowers can be started earlier under cover and return year after year, while biennial flowers such as foxglove and sweet william are sown in summer to bloom the following year.
Sow thinly — overcrowding produces weak, leggy seedlings — and remember that many flower seeds need light to germinate, so press fine seed onto the surface and barely cover it. Keep the surface evenly moist but never waterlogged, and give seedlings plenty of light as soon as they appear.
Annual, perennial or biennial — which to choose?
Annual
Lives one season — sow each year
Sunflower · Cosmos · Zinnia · Nasturtium
Perennial
Comes back every year
Lupin · Rudbeckia · Echinacea · Delphinium
Annuals grow, flower and finish in a single season, so you sow them fresh each year — fast, and great for quick colour. Perennials return for years from a single sowing, while biennials spend their first year as leaves and flower in the second. Mixing all three gives colour now and for seasons to come.
Easy flowers for beginners
If it is your first time, start with forgiving, fast growers:
- Sunflower — big, quick and almost foolproof; loved by children and bees.
- Nasturtium — easy from a direct sowing, and the flowers are edible.
- Calendula — pot marigold flowers for months and self-seeds happily.
- Cosmos — airy, long-flowering and brilliant for cutting.
- Zinnia and cornflower — bright, dependable and great for bouquets.
Where to grow your flowers
Most flowers are happy in three settings. In pots and containers on a balcony or patio, compact varieties flower all summer — see our container-friendly flowers. In a border, mix annuals for instant colour with perennials for lasting structure. And for a dedicated cutting patch, grow rows of cut flowers for fresh bouquets all season. Give them a bright, sheltered spot with free-draining soil and at least six hours of sun.
Caring for your flowers
- Light 6+ hours sun for most
- Water when the surface dries; never soggy
- Deadhead to keep more flowers coming
- Feed lightly in pots
Give flowers plenty of light, water when the surface starts to dry, and deadhead spent blooms regularly — removing faded flowers tells the plant to make more rather than set seed. Feed lightly through the growing season if plants are in pots, where nutrients run out faster, and stake tall varieties before they flop.
Keeping the colour going
Sow a few seeds every few weeks — “succession sowing” — so fresh plants keep coming into flower as earlier ones fade. Towards the end of summer you can collect and dry seed from favourites, and leave some seed heads standing for the birds. Many pollinator-friendly flowers will also self-seed and return on their own next year.
Common beginner mistakes
- Burying seed too deep — many flower seeds need light and only a fine covering.
- Overwatering — soggy compost rots seedlings; aim for moist, not wet.
- Too little light — pale, leggy seedlings are asking for a brighter spot.
- Sowing tender flowers too early — wait for warmth, or start them indoors.
Frequently asked questions
How long do flower seeds take to germinate?
Usually 7–21 days depending on the variety; each packet lists the germination time.
Can I sow flower seeds straight outdoors?
Yes — many hardy annuals do well direct-sown after the last frost. Tender or slow varieties do better started indoors.
Which flowers are easiest for beginners?
Sunflower, nasturtium, calendula, cosmos and zinnia are forgiving and fast.
Do flower seeds need light to germinate?
Many fine seeds do — sow them on the surface and barely cover. Larger seeds can be covered to about twice their depth.
What is the difference between annual, perennial and biennial flowers?
Annuals last one season; perennials come back year after year; biennials flower in their second year.
Ready to start? Browse all flower seeds.
