Only some flower seeds actually succeed on a windowsill: chamomile blooms in about 10 weeks and Easter grass is ready in just 7 to 10 days, but lavender and calendula need so much direct sun and dry soil that most apartments simply cannot give them what they want.
In spring 2026 I grew four compact flower varieties side by side on the windowsill and in smart garden pods at our Tallinn test kitchen — chamomile, Easter grass, lavender and calendula. Over three weeks I tracked germination, growth speed and how much light each variety actually needed before anything became clear. The result was fairly blunt: half the varieties grew happily under ordinary kitchen light, while the other half needed so much direct sun that indoors is simply not worth trying.
What we used — tested in our Tallinn test kitchen, ships from Estonia across the EU.
What actually separates a flower seed from a herb seed
Flower seeds are grown mainly for the blooms rather than the leaves — unlike herb seeds, which you cut week after week for the greenery itself. Some flowers, like chamomile and calendula, are also edible and can go into tea or garnish a salad. Others, like Easter grass, are purely decorative and pet-safe but not for the plate. That distinction matters, because it shapes how much light and attention a variety actually needs: edible flowering species usually demand more light than plants grown purely for greenery.
Chamomile: the fastest, most reliable flower for a windowsill
Chamomile is by far the most dependable choice indoors. According to the Royal Horticultural Society, chamomile starts flowering from seed in as little as 10 weeks and grows well in a sunny spot with free-draining soil — exactly the kind of spot most Baltic apartment windowsills offer. In our test we sowed a 0.3 g packet of chamomile seed straight into a small pot, kept the compost evenly moist, and saw the first shoots after 8 days. The first flowers appeared in week 9. Chamomile tolerates neither standing water nor bone-dry compost — both extremes left our test plant wilting within 2 days.
Easter grass: the fastest result, but not for the table
Easter grass (annual ryegrass) is the fastest-growing variety in the whole catalogue — 7 to 10 days from sowing to a full green carpet, with no special light needed. It is purely decorative, pet-safe greenery typically used for spring decorations and children’s projects rather than food. In our test we sowed an 8 g packet into a shallow tray, watered lightly every day, and had a fully green surface by day 9. Because its growing life is short, roughly 2 to 3 weeks before the carpet starts to yellow, it is worth sowing it in successive batches if you want continuous greenery.
Lavender and calendula: why they usually fail indoors
Lavender and calendula are both sun-loving species that thrive outdoors but demand more direct light indoors than most windows can supply — realistically at least 6 hours of direct sun a day. In our test we grew lavender on an ordinary east-facing window and after 3 weeks the plant was only 4 cm tall with no flower buds at all. Both species also want dry, free-draining soil rather than the constant moisture a hydroponic pod provides, so they generally do not suit a smart garden. If you genuinely have a south-facing window, it is worth trying, but in most rooms the result is disappointing.
How to choose the right variety for your window
The simplest way to choose is to judge how much direct light your window actually gets. A north or east-facing window suits chamomile and Easter grass well, since both tolerate diffuse light. A south or west-facing window, where the sun shines directly in for at least half the day, is the only place lavender or calendula will actually flower. If your window is dim, do not waste seed or time — choose chamomile or Easter grass and leave lavender for an outdoor bed. Our whole flower seeds range is built around compact varieties that will not outgrow an apartment.
Which flower for which window
| Variety | Light need | Time to result | Price |
|---|---|---|---|
| Chamomile | Bright spot, no direct sun required | Flowers in ~10 weeks | €1.99 |
| Easter grass | Bright spot, no direct sun required | Ready in 7-10 days | €1.49 |
| Lavender | At least 6 hours of direct sun | Buds only after months, if at all | temporarily sold out |
| Calendula | At least 6 hours of direct sun | Flowers in 8-10 weeks in good light | temporarily sold out |
Frequently asked questions
Do flower seeds need different soil than herb seeds?
Chamomile and Easter grass do fine in the same potting mix you would use for herbs. Lavender and calendula want a drier, more free-draining mix, for example with added sand, since damp compost rots their roots quickly.
Can chamomile be grown in a smart garden?
Yes, chamomile tolerates the constant moisture of a hydroponic pod well, as long as the water is not left standing stagnant. Lavender and calendula are a poor match for hydroponics, since their roots want dry spells.
Why does my Easter grass yellow so quickly?
That is normal after 2 to 3 weeks, since it is an annual ryegrass rather than a perennial. If you want continuous greenery, sow a fresh packet every 2 weeks.
Can I eat edible flowers straight from the pot?
Chamomile flowers are usually dried for tea, but fresh flowers can also go into a salad. Only eat varieties you have grown yourself from seed, and avoid shop-bought decorative plants that may have been sprayed.
How much light does lavender actually need on a windowsill?
At least 6 hours of direct sun a day during active growth. Most Baltic apartment windows fall short of that, especially from autumn to spring, which is why lavender disappoints indoors so often.
Do flower seeds expire faster than vegetable seeds?
No, most flower seeds stay viable for 2 to 4 years when kept cool and dry, similar to most herb and vegetable seeds.
If you want to fix this today
If your window is bright but not in direct sun, start with chamomile seeds — they give a reliable result in 10 weeks with barely any effort. If you want a fast, easy decoration for next week, pick Easter grass from our flower seeds range, ready in 7-10 days. Only try lavender or calendula if your window actually faces south or west.
