When Can I Start Growing American Marigold Seeds In Massachusetts In A Greenhouse

When can I start growing American marigold seeds in Massachusetts in a greenhouse? This is a question that you must determine before sowing seeds, but the answer is as simple as marking your calendar eight weeks before the last frost. On the other hand, you can plant the seeds after the frost if you’re not using a greenhouse and want to cultivate it outdoors. 

But how does one determine the frost date of Massachusetts? Regardless of your state, every greenhouse grower must know the hardiness zone of their location. Massachusetts is in zones 5a to 7a, and you can use this to mark your calendar and determine the frost date.

When Can I Start Growing American Marigold Seeds In Massachusetts In A Greenhouse

American marigolds will thrive in Massachusetts since it is hardy for zones 3 to 11. These gorgeous flowers bloom in spring, summer, and fall, and are native to Mexico and Central America. They also go by the name African marigolds and Mexican marigolds, and you can distinguish them from being the tallest and most upright marigold. 


When Can I Start Growing American Marigold Seeds In Massachusetts In A Greenhouse: Calendar For Planting

You can start your marigold seeds indoors in Massachusetts before the last frost date. This can be eight weeks before or fifty days before. According to the University of Massachusetts Amherst, most areas in the state have their last frost date on May 15. 


Eight weeks before the last frost date

As mentioned previously, planting American marigold seeds in the greenhouse is best to do eight weeks before the last frost. Using the hardiness zone of your area in Massachusetts, you can determine this exact date. However, the time will be different if you are planting outdoors since it will be after frost and usually in spring. 

In general, the Massachusetts Master Gardener Association also recommends starting your seeds on the date counted away from the last frost date of your area. Marigolds are best to start indoors so you can get an earlier bloom. However, these plants have a short period from seeding to blooming anyway, and that’s why it’s possible to sow them after the danger of frost outdoors. 

Using the greenhouse is more strategic for gardeners, mainly because it allows you to safely start the flowers indoors. You can remember that the majority of areas in Massachusetts get their last frost at around May 15. Keeping this in mind, you can count back the number of weeks from when you want to transplant the marigolds into the greenhouse 


Fifty days before the last frost date

If you have started your marigolds around 50 days before the last frost date, this will prepare them well for mid-spring planting. Doing so, your plants will be at the right size without the need to worry about the challenges of the outdoor climate. You don’t even have to wait long for the seedlings to germinate.

Once this happens, remember to ensure that the plants get 6 hours of light per day. You can then thin the seedlings once you see the second set of leaves. Transplant them in their pot while waiting for the last frost date inside the greenhouse. 


Other Considerations For Growing American Marigold In A Greenhouse

After finding the answer to when I can start growing America marigold seeds in Massachusetts in a greenhouse, the success of your flowers will depend on other conditions. For example, seed germination will happen in as early as 4 to 14 days. However, this depends on the soil temperature, which should be between 70 to 75°F and indoor temperatures at 65 to 75°F.

Inside the greenhouse, you must use a warm and moist flower bed for sowing the seeds. After planting, you can expect the marigolds to bloom in 50 days until frost. Add organic matter to the soil and check the soil pH as it should be at 6.0 to 7.0. For the spacing, large varieties should be apart at 24 inches, 15 inches for medium types, and 6 inches for dwarf marigolds. 


What Makes American Marigolds Different From Other Marigolds?

Compared to other marigolds, you’ll notice that American ones are best planted in the spring. This is because they mature more slowly than French marigolds, for example. These tall flowers can act as planting pockets, or you can add them in front of shrubs to add some color in the garden. 

American marigolds will surely stand out as center or rear attraction in beds and borders. Some gardeners grow American marigolds to create a hedge around their herb garden as well. But what are the best varieties to cultivate? 

The popular ones include Antigua Series, Jubilee Series, and Vanilla. For hedges, Gold Coin Series American marigolds are excellent. 



Massachusetts is an excellent state for growing flowers. One of the common ones you’ll find are American marigolds, which can inspire you to question, “when can I start growing American marigold seeds in Massachusetts in a greenhouse?” You can plant the seeds before the last frost date, either eight weeks before or fifty days before. 

Knowing the hardiness zone of your area will help you determine the frost date accurately. While the last frost date in most areas in the state is on May 15, the hardiness zones in Massachusetts range from zone 5 to 7. Therefore, you must check your seasons to prevent drawbacks. 


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How To Prevent Root Rot In Hydroponics: 3 Useful Tips

If you’re a newbie gardener who’s looking to find ways to hone your skills, you’d want to learn how to prevent root rot in hydroponics even before this problem affects your plants.

Hydroponics can be advantageous to crops in more ways than one. However, it also comes with risks of diseases, such as root rot, which can be destructive or even lethal to your plants.

Unfortunately, there are no effective methods to recover the wilted parts that were affected by the root rot once it hits your plants. The only thing you can do if you do not want this catastrophe to befall your crops is to prevent it before it happens. Read on to learn more about this subject.


What is Root Rot?

Root rot is a disease that attacks the plant roots and causes them to suffer decay. This usually happens when a lack of oxygen supply occurs in the substrate.

To give you an idea, think about plant roots that are submerged in water that only has a little oxygen in it. Over time, the plant suffocates and dies.

Aside from rot and decay, this disease also leads to the proliferation of fungi that are naturally present in the soil. These include Rhizoctonia, Alternaria, Pythium, Botrytis, Fusarium, or Phytophthora. As soon as fungi colonies start to grow, they tend to target the weakened roots and infect your precious plant babies.

Once the plant becomes infected, they won’t be able to take in what they need to grow – water, oxygen, and other nutrients. When this happens, it won’t be long before the plant dies.


What is Hydroponics?

In case you’re not aware, the term hydroponic is derived from a Latin word that means “working water”. To put it simply, hydroponics is an art that involves growing various types of plants without soil. If you’re like most people, the first thing that comes to mind when somebody talks about hydroponics would be a picture of plants with roots suspended into the water without using any type of growing medium.


Avoiding Root Rot in Hydroponic Systems

Detecting and identifying root rot can be tricky. When your plants get infected, their leaves and roots gradually wither until the whole crop itself dies from the lack of nutrients, which is a common symptom of many diseases.


What causes root rot in hydroponics?

One of the requirements in hydroponics systems is oxygen. Without it, your plants are basically on the road to death. On the other hand, lack of such is one of the major triggers for root rot, and it must be avoided at all costs.

Just like when planting in soil, you loosen up the ground so that your plants’ roots can have their required intake of oxygen. That is the case for crops grown in aqueous solutions as well. If they cannot breathe, they would not be able to grow.

Another agent for root rot is the temperature. The last thing you would want in your system are parasites that leech nutrients intended for your plants and infect the water during the process. In common terms, these fungi are called molds.

One of the best breeding grounds for these is warm and moist areas. For this reason, if the water temperature inside your reservoir is high, then you are susceptible to it. Something as minor as letting the solutions exposed to sunlight can already be a risk factor.


3 Useful Tips on How to prevent root rot in hydroponics

There is good news! Root rot in hydroponics can be prevented! Just follow these tips:

Tip#1: Use the right air pump

If you do not want root rot to affect your plants, you merely have to avoid its causes. If you need oxygen, keep the water bubbling by providing an air pump of appropriate size, and also give importance to proper ventilation in the room.


Tip #2: Maintain the temperature

The temperature should be maintained within the 70 to 80 degrees F range. Get rid of any materials that can make your system vulnerable to infections, and make sure not to disturb your crops while they are trying to grow.


Tip #3: Get rid of the rotten parts

However, if you failed in preventing the disease, then the rotten parts should be removed immediately. Cut them off as there is no chance of reviving them, and focus on the potential new growth instead. Fix your hydroponics system and eliminate the risks.


Why Give Greenhouse Gardening a Try?

Greenhouse gardening offers numerous benefits to greens aficionados who dare to take their gardening experience to the next level. Aside from acting as a shield against the effects of inclement weather, a mini, hobby, or semi-pro greenhouse can also serve as a protective layer that keeps harmful bugs and critters at bay.

What’s more, its enclosed structure allows you to control your plants’ growing conditions including the temperature, light, moisture, and ventilation of the greenhouse’s internal environment. With a controlled environment, you’ll be able to extend growing seasons and grow plants that aren’t native to your area.



No matter how well-informed you are about how to prevent root rot in hydroponics, you cannot completely eradicate the risks. Therefore, to avoid the worst-case scenario, you should be prepared to sacrifice the infected for the sake of others. While you’re at it, consider trying your hand at greenhouse gardening as well.


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