Marigold Care

Butterfly on a marigold bloom

Marigolds are a popular annual for borders, hanging arrangements, gardens and pots. Once planted, there are certain steps you can take to ensure that your marigolds grow to be the more vibrant they can be.

We put together an outline of some important things to consider for your marigold care.

About marigolds

Marigolds are known for their bright blossoms of blooms, ease of care through the summer and even their practical use, including insect-repelling odors and edible flowers!

Marigolds come in a variety of colors, with some of the popular ones being bright orange, yellow and an orange/yellow mix.

The proper marigold care is important for the best growth of your plants! Let’s start with marigold’s sunlight requirements.

Yellow marigold blooms

Sunlight requirement

First, you’ll want to make sure your marigolds are able to get plenty of sunlight. Most varieties will need at least 6 hours of sunlight a day in order to keep a strong green color and vibrant blooms.

A sign that your plant may not be getting as much sun as it should is if the plant stops blooming or the plants’ leaves become more dull.

Marigold temperature needs

Due to their heat tolerance, marigolds are a favorite in southern states (growing zones 8, 9, 10), but they can also be grown in northern states in the United States.

The more north you are, the shorter your marigolds’ growing season may be, but typically their quick germination and maturing helps the plant become a great display even with a shorter growing season.

For example, marigolds grow great in our Pennsylvania climate, often lasting all summer long into the fall when the first frost hits.

Marigolds’ temperature needs will vary according to whatever stage of growing it is in.

Like many annuals, marigolds shouldn’t be planted outside in your area before the average final frost date.

The exact time depends on your location — for Central PA, waiting until after Mother’s Day is a safe bet. This goes for planting plugs or seeds into the soil outside.

If you are planting the marigolds into pots or other containers, you may be able to get away with planting them outside earlier, but you’ll likely want to bring the plants inside over colder spring nights.

Seeds that are planted in the soil safely (assuming you wait until after the last frost) can germinate and being to sprout within a few weeks!

By the time marigolds are fully grown and mature you likely won’t have to worry about the cold affecting your plants. During the summer months marigolds tend to withstand the heat well.

As long as you continue to water and fertilize the plants through the summer, marigolds will tolerate a lot of heat.

If you are having an extreme heatwave you may notice that your marigolds lose their flowers or just don’t produce as much. This is normal. Continue to water and care for the plant and it will come out of the heatwave stronger than ever and will eventually begin blooming again.

Orange marigold blooms

Marigold care: height and spread of plants

Marigolds grow to be different heights and widths depending on the cultivar (the marigold variety). Typically, each plant’s height ranges from 6″ all the way up to 2 feet! You’ll want to plant marigolds 6″-20″ apart from each other, depending on how much you want them to grow into each other.

Given the different varieties, here’s a look at some of our popular varieties’ heights and spreads:

  • Bonanza Yellow marigolds: Up to a foot tall, with a spread of about 8 inches
  • Super Hero™ Spry marigolds: Grows 10-12 inches tall and wide
  • Bonanza Orange marigolds: Grows 10-12 inches tall and spreads 6-10 inches wide

Marigolds’ height, spread and even bloom size will vary a good bit according to their variety.

Soil type for the best marigold care

Like most annuals, marigolds will need well-drained soil. Root rot is always a probable disease in most areas when planting marigolds in soil that doesn’t drain well.

Well-drained soil usually means that the soil is properly aerated as well. This provides the plants’ root system plenty of oxygen and promotes nutrients for the plant to feed off of.

Marigold fertilizer needs

Plant marigolds in fertile soil that has plenty of organic matter, if possible.

If you haven’t prepared any soil or are planting the flowers in potting soil, make sure you fertilize the plant throughout the summer. Slow-release fertilizer can also be planted with the soil to help with providing the plant with some nutrients.

Marigolds blooming in a garden

Disease and pest control

The diseases that a marigold is prone to will vary greatly by how its cared for, where its planted and the climate and weather of the season.

Root rot, a disease that different fungi can cause, may cause your marigold to wilt or shrivel up. The plant may be more prone to this disease if its over-watered or if its planted in soil that doesn’t drain well.

Other disease, such as ones that may be more specific to your state, can stunt the growth or even kill marigolds. Here’s a guide to some diseases for marigolds grown in Pennsylvania.

Marigold care: pruning marigolds

Close up of a marigold bloom

Marigolds don’t require a lot of pruning — left to themselves they will grow to be bushy and vibrant, as long as they are properly cared for.

Cutting back a marigold plant can promote new growth and oftentimes will result in a healthier plant. If the plants’ blooming is slowing down, pinching off spent blooms can also encourage the plant to grow more vibrant blooms. As with most annuals, cutting back the plant a few times throughout the summer will make for a healthy plant.

Propagation of marigolds

Marigold plants will germinate and sprout comparably quicker than some annuals, so starting from seed may be a simpler option than propagating from a parent plant.

If, however, you are wanting to propagate marigolds, you can do that by cutting a branch or stem off of your mother plant and strip the leaves off the bottom of the plant. Then, placing the marigold in water or moist soil and keeping it out of direct light, the branch should begin to plant its own roots.

For some annuals a rooting hormone powder can be used to dip the branches in when planting them in soil, but for marigolds you can get away without doing this.

Marigolds blooming

Marigold care recap

Marigolds are a great, easy-care annual that can be grown in many growing zones across the United States. For a plant with beautiful blooms, an insect-repellent smell (these are great to plant in your garden) and a vibrant plant to grow all summer long, marigolds won’t let you down.