Growing Parsley Hydroponically: A Complete Tower Garden Guide
Parsley is one of those herbs that's easy to overlook until you grow your own. Instead of buying a bunch for one recipe and finding the rest wilted in the refrigerator a few days later, you can harvest exactly what you need straight from your Tower Garden.
Both curly and flat-leaf parsley grow well hydroponically or aeroponically, indoors or outside. Once established, parsley is relatively easy to maintain and can be harvested repeatedly rather than pulling the entire plant.
🌿 The realistic answer: Parsley is easy to grow once it's established. It's a little slower to germinate than herbs such as basil, but we typically see parsley seedlings emerge within about 1–2 weeks.
Curly vs. Flat-Leaf Parsley
The two types of parsley you're most likely to grow are curly parsley and flat-leaf, or Italian, parsley. Both work well in a Tower Garden, so the choice mostly comes down to what you like to eat and cook with.
🌿 Curly Parsley
Curly parsley (Petroselinum crispum) has tightly ruffled leaves and a compact, distinctive appearance. It's often used as a garnish, but it's also useful in salads, soups, sauces and herb mixtures.
🌿 Flat-Leaf or Italian Parsley
Flat-leaf parsley has broader, flatter leaves and a stronger flavor than curly parsley. It's particularly useful when parsley is an important part of the recipe rather than simply a garnish.
There's no need to change your Tower Garden setup based on which one you choose. You can grow both varieties using the same basic care.
Starting Parsley from Seed
Parsley is a little slower to germinate than many of the other herbs we grow, so it requires some patience when starting from seed.
Plant 6 or more parsley seeds per rockwool cube and keep the cube consistently moist while you're waiting for germination. We typically see parsley germinate in approximately 1–2 weeks.
Don't keep the rockwool saturated or sitting in water. Seeds need moisture, but they also need oxygen.
Because parsley is slower than crops such as basil and lettuce, don't assume the seeds have failed just because other seedlings in your tray have already sprouted.
Once the seedlings are established and large enough to transplant, move the entire rockwool cube into the Tower Garden. You do not need to thin the cube down to one parsley plant.
For more information about starting plants, see our Seeds & Seedlings Guide and How Many Seeds Should I Plant?.
Where to Plant Parsley in a Tower Garden
Parsley is easy to fit into a mixed Tower Garden because it doesn't produce heavy fruit, sprawling vines or a large support structure.
We generally place parsley around the middle portion of the Tower Garden. Give it enough room for the foliage to develop without being shaded by larger plants.
If you're growing parsley with fast-growing crops such as basil, keep an eye on neighboring plants. A large basil plant can eventually shade a slower-growing parsley plant even if everything looked perfectly spaced when you first planted the tower.
How Much Light Does Parsley Need?
Outdoors, parsley grows well in good direct sunlight but can tolerate some partial shade. In very warm climates, a little protection from the strongest afternoon sun can sometimes be helpful.
Indoors, use Tower Garden grow lights for approximately 14–16 hours per day and give the plants complete darkness overnight.
Keep the lights approximately 6–8 inches above the tops of the plants, adjusting them as your herbs grow.
If parsley becomes stretched, thin or starts leaning strongly toward the light, check whether it is receiving enough usable light or being shaded by neighboring plants.
See our Tower Garden Light Guide for more information.
Best Temperature for Growing Parsley
Parsley generally prefers cooler to mild growing conditions and handles cool weather better than warm-season herbs such as basil.
That makes parsley a particularly useful herb during the cooler growing season, although it can be grown for much more of the year when conditions are managed appropriately.
As temperatures climb, watch the plant for heat stress and make sure the Tower Garden reservoir isn't getting excessively warm. Hot weather can also increase water use.
Growing several herbs together? They don't all have identical temperature preferences. Parsley and cilantro generally appreciate cooler conditions more than basil does, which is worth remembering when you're deciding what to plant together outdoors.
Water & Nutrients for Hydroponic Parsley
Parsley does not need its own special fertilizer. You can grow it using the same Tower Garden Mineral Blend used for the other plants in your Tower Garden.
For established plants, our standard concentration is 20 mL of Mineral Blend A and 20 mL of Mineral Blend B per gallon of water.
For young seedlings, use approximately 10 mL of A and 10 mL of B per gallon.
During very hot weather, we may reduce nutrient strength to half or even quarter strength depending on growing conditions.
Keep the Tower Garden reservoir around pH 5.5–6.5.
Water quality matters too. If you're using city water containing chlorine or chloramine, filtered water can help eliminate water quality as a source of plant problems.
See our Tower Garden Nutrients Guide and Tower Garden Water Guide for detailed instructions.
Can You Grow Parsley Indoors?
Yes. Parsley is a good choice for an indoor Tower Garden because it doesn't require pollination, fruit support or room for vines.
The biggest consideration indoors is light. Provide approximately 14–16 hours of grow light each day, keep the lights positioned correctly as the plant grows and give the plants complete darkness overnight.
Parsley can also share an indoor Tower Garden with lettuce, leafy greens and other herbs. Just watch the canopy so faster-growing plants don't block its light.
How to Harvest Parsley
Parsley responds well to regular harvesting, but where you cut matters.
Harvest the larger outer stems first rather than simply trimming across the top of the plant. Cut the stems low, approximately 1–2 inches above the rockwool cube, while leaving younger growth in the center to continue developing.
Regular harvesting keeps fresh growth coming and prevents the plant from becoming overcrowded.
Don't pull the whole plant. One of the advantages of growing parsley in your Tower Garden is being able to take what you need and allow the plant to keep producing.
What Happens When Parsley Bolts or Flowers?
Eventually parsley may shift away from producing the leafy growth you're harvesting and begin sending up taller flowering stems.
Once a plant is putting significant energy into flowering and seed production, leaf quality and production can decline. At that point, you can decide whether to let it flower or replace it with a younger plant for continued leaf harvests.
If you want a continuous supply of parsley, starting replacement seedlings before an older plant reaches the end of its productive life can prevent a gap between harvests.
Common Problems When Growing Parsley Hydroponically
Parsley Seeds Aren't Germinating
Parsley is slower to germinate than many common herbs. We typically see germination within about 1–2 weeks, so give it a little more time than basil or lettuce. Also check that the rockwool is staying consistently moist without being waterlogged.
Parsley Is Tall, Thin or Leggy
Check the amount of light reaching the plant. Make sure neighboring plants aren't shading it and, indoors, check the distance between the plant and your grow lights.
Leaves Are Yellowing
Yellow leaves don't automatically mean the plant needs more nutrients. Check pH, nutrient strength, water quality, root health, temperature and the condition of the reservoir before adding more Mineral Blend.
Parsley Isn't Growing Very Fast
Young parsley can simply be slower than crops such as basil. If an established plant isn't growing well, check light, temperature, roots, water quality, pH and nutrient strength.
Parsley Is Flowering
The plant is moving into its reproductive stage. If your goal is a continuous supply of leaves, this is a good time to have replacement seedlings growing.
Common Parsley Pests & Diseases
Parsley is generally straightforward to grow, but it can still attract common garden pests.
Check your plants regularly, including underneath the leaves and around new growth. Aphids, whiteflies, spider mites and caterpillars are all worth watching for, particularly when parsley is growing outdoors alongside other crops.
Good airflow and removing old or damaged foliage can also help keep the plant canopy healthier.
If you notice a problem, identify it before treating it. Our Tower Garden Pests & Diseases Guide can help you work out what you're dealing with and what to do next.
Ways to Use Fresh Parsley
Once you have parsley growing a few steps from the kitchen, you'll probably find yourself using it for much more than garnish.
- Add chopped flat-leaf parsley to soups, sauces and pasta dishes.
- Use it in chimichurri with garlic, olive oil and vinegar.
- Blend it into pesto on its own or with other fresh herbs.
- Add fresh parsley to salads, grain bowls and roasted vegetables.
- Mix chopped parsley with lemon and garlic for an easy finishing herb.
Harvesting only what you need also means the rest stays alive on the plant instead of slowly deteriorating in the refrigerator.
Is Parsley a Good Crop for a Tower Garden?
Yes. Parsley is particularly useful if you want a crop that doesn't need pollination, trellising or fruit support and can be harvested repeatedly.
The only part that requires a little extra patience is germination. Once parsley is established, it's a relatively low-maintenance addition to an indoor or outdoor Tower Garden.
And because you can harvest individual stems instead of the entire plant, one planting can give you fresh parsley for far longer than a bunch from the grocery store.
Ready to Grow Parsley?
Start parsley from seed or skip the germination stage and begin with a Living Towers seedling.
