How to Grow Dill Indoors

Like all edible plants, Dill plants need lots of light to grow and develop good flavor. Sunlight is excellent for plant growth (and free!) and you might be lucky enough to have a spot that’s got the 5+ hours of direct sun they need. Even with a bright window, it’s unlikely that you’ll have enough natural light in the winter so we recommend a grow light for anyone who wants a constant supply of flavorful produce.

For an introduction to grow lights, head over to our post on grow lights for indoor gardeners. We’ve also got a buying guide for screw in types, but to keep things simple in this guide, we’ll just provide directions for the 24W Screw in Bulb by Sansi, which we think is a good middle-of-the-road option.

How bright should your grow light be? 

Dill plants need the equivalent of 5+ hours of direct sunlight [DLI of 15+ mol/m²/day] to grow their best. In order to provide an equivalent amount with a grow light, it needs to be pretty bright! The 24W Sansi bulb should be placed 6 inches away from the top of the plant. This will give your PPFD (the standard measure of brightness) of 500 μmol/m²/s.

How many hours per day do your Dill plants need under a grow light?

Dill plants are known as “long-day”. When they sense over 12 hours of light per day, they’ll start the end of their lifecycle and work on making seeds.  We want to keep them in an earlier stage so we can keep harvesting the leaves, so we recommend setting up a timer to leave it on for only 10 hours per day.

What is the Right Dill Germination Temperature?

Dill Plants Grow Faster in Warmer Temps

Dill plants are called “warm-weather crops” and will speed up their metabolism when temperatures are warmer. On the other hand, if things get too hot they’ll wilt and become prone to disease. Ideal temperatures are around 70°F but anything between 60 and 90°F grows well.

Water and Humidity

Herbs such as dill thrive on an adequate amount of moisture but can suffer if they’re waterlogged, so make sure to water them just enough, especially if you’re using soil. To avoid your dill being waterlogged, make sure to use a pot with drainage, or just use self-watering pots, as mentioned above.

Nutrients and Fertilizers

Dill likes to start with nutrients that are equal parts nitrogen, phosphorus, and potassium (with NPK numbers like 10-10-10). For this Balanced Blend we recommend: Dr Earth All Purpose

Once they are growing, it’s better to use plant food that is high in nitrogen (with NPK numbers like 10-5-5). For this Herb Blend, we recommend: Joyful Dirt All Purpose

Moving Your Dill Plant Outdoors

Dill mostly thrives in warm temperatures, as we talked about above. So we suggest moving your dill plant outdoors only when the temperature is warm enough. To learn more about how to grow your dill outdoors, check this out. (coming soon!)

Timeline and Steps on How to Grow Dill Indoors

Dill grows quickly from seed. Plant 3 sites in a 4" / 1-pint container. In larger containers, space sites 3" apart. For each site plant 2 seeds 1/4 inches deep. Keep the soil warm ( 60-70°F, ideally 65°F). Sprouts typically appear in 14 days but can be as quick as 10 days or as long as 21 days depending on your conditions. 

Propagating Dill: How to Clone from a Stem Cutting

If you’ve already got a Dill plant you love (or a friend does!) you can easily “clone” it with just sharp scissors and a clean glass of water. First, cut a couple 6” shoots of new growth (avoid anything woody). Next, remove the lower leaves, so the bottom half is just stem. Place in a glass of 3” of water, making sure the cut leaf spots are underwater. 

Place the glass on a bright windowsill and change the water every few days. In a couple of weeks, roots should emerge and you can transplant them into your container. While using additional rooting hormones won't hurt, it’s not necessary with Dill plants. 

1. Cut 6” section of new growth
2. Remove leaves halfway and place them in the water on a sunny window sill 
3. Wait 7 days for a few ½ inch roots to form and carefully transplant into it final container

How to Transplant Dill

Live starter plants give you a big jump start on your first harvest. When you’re in a garden center - pick the bushiest plant available (tall and lanky ones will be weak growers) and give it a good inspection for pests. Leaves should be dark green without holes, spots, or curled edges. A best practice is to actually “quarantine” your plant for about a week after bringing it home to make sure it's free and clear of ride-on pests. 

Ensuring it’s pest and disease-free it’s time to transplant your seedling into its final home.

1. Remove some soil from its final planter - leaving enough space for the bottom of the seedling to be just higher than the soil surface.
2. Hold on to the base of the stem with one hand, and turn the pot over while gently pulling the seedling. Giving the pot a few squeezes can help dislodge it.  
3. Place in its final container and fill around it with soil so that it’s tight, but not compacted.  

Week 2-3: Check for Sprouts

You could see seedlings in as little as 10 days (though 14 days is more typical). If it’s been 21 days and you still don’t have any sprouts, it’s likely that your setup is too cold.

Week 3: Thin Your Seedlings

Thin your planter to only have 1 seedling per site -  leaving the largest plant. If you are using the recommended planter (at least 4" / 1 pint) this will mean you’ve got 3 plants after thinning.  By getting rid of the smaller seedlings, you’re allowing the biggest and strongest one to flourish by reducing its competition for water, food, and space. 

If your seedlings are under 1 inch, stretching out, or folding over, it’s likely that they don't have quite enough light.

Week 8: How to Prune Dill

You’ll notice how all the stems and leaves of Dill grow from a single, central point (called radial growth). The plant puts out new leaves in the center and pushes old leaves outward, getting bigger and bushier over time. 

Pruning and harvesting are one-in-the-same with Dill. Once the plant at least 3 separate stems coming from the base take one of the outside leaves and cut it close to the base (½” above is fine). It’s good to leave at least 2/3rds of the plant left to regrow. If you only want a tiny amount of herbs, you also can clip the top of an individual stem – just be sure to leave some leaves on that stem, otherwise it won’t grow back.

Month 3+: How to Harvest Dill

Cut the stem clear to the base - only cutting what you can use fresh. Each time you cut, new stems will come in to replace them - kind of like mowing the lawn. 

How to Use Your Freshly-harvested Dill in Cooking

Dill’s feathery herbs are commonly used around the kitchen to spice up many types of dishes. They can be used in many ways such as:

1. Added as a garnish to soups 
2. Spicing up your pickles
3. Toppings or added flavoring for bread and other dishes

Check out some more of our favorite dill recipes here.

How to Preserve Dill

There are several ways to preserve or keep your herbs fresh, and here are just some of the easiest and the ones we recommend the most:

1. Lazy person technique. It involves keeping the fresh herbs in their original packaging and simply storing them in the fridge.
2. Storing the herbs in a glass of water inside the fridge. You can do this by cutting the end of the stem of your herb, filling a glass jar or cup with water, and placing your herb inside. Almost like a vase or bouquet of herbs!
3. Keep in a glass of water under natural lighting.
4. Wrap loosely in a damp paper towel.
5. Freeze them herbs! Yes, you can freeze fresh herbs such as dill to use at a later time! All you need are some ice cube trays and a freezer, and you’re all set.

Learn more about how to preserve and keep your herbs and dill fresh here.

Month 6+: End of Life

Once your dill plant is mature, it’ll decide that it’s time to make seeds & die off. Delay this by clipping flower stalks as soon as you see them. It’s best to catch them as early as possible.

If you’d like to learn about the dozens of other herbs, fruits, and vegetables that you can grow indoors then grab a copy of our free eBook below.

Best Dill varieties to grow inside.

There are 13 popular varieties of dill, and we have picked out the 4 best grown indoors for you: