When To Start Growing Vegetables In A Greenhouse

A year-round productive vegetable garden from February is possible if you know when to start growing vegetables in a greenhouse. Perhaps the most significant advantage in greenhouse farming is that you can start growing from the beginning of the year until the last month. If you’re using a heated greenhouse, it’s even possible to grow vegetables amidst all seasons. 

More than knowing when to start growing vegetables in a greenhouse, you must consider the seasons and classify plants into hardy, cold-season, and warm-season crops. Learning about the planting zones in your state will also work to your advantage because it lets you know what plants will survive. To give you a general idea, those rated zone 1a have extreme annual temperatures of -60 to -55°F, while zone 13b is 65 to 70°F.

When To Start Growing Vegetables In A Greenhouse

How To Know When To Start Growing Vegetables In A Greenhouse

You can start growing vegetables in a greenhouse as early as February in locations like Colorado because it is suitable for cool-season and warm-season plants. This is why you will know when to start growing vegetables in your area if you know your planting zone and expected conditions. And since you’ll be using a greenhouse, you can adjust the indoor conditions accordingly.


Classify vegetables


Hardy vegetables

Winter gardening is risky even in a greenhouse, but you can still start hardy, frost-tolerant crops in December or January. Some gardeners in Oregon also mentioned some vegetables could withstand a heavy frost. Common hardy plants for cold temperatures are beets, spinach, leeks, kale, turnips, carrots, radishes, Brussels sprouts, and Swiss chard. 

You can harden frost-tolerant crops by gradually introducing them to outdoor conditions and then begin to transplant in February or March. Bulb onions are even hardy enough for January transplanting. There are also semi-hardy vegetables that are ideal for cool-season planting in the greenhouse. 


Cool-season vegetables

You can grow broccoli, cauliflower, cabbage, and lettuce at the beginning of March in the greenhouse. Parsley and celery can also withstand light frost. These vegetables are best hardened off and transplanted in April.

If you’re in a temperate region, it’s also possible to start a second crop of cool-season vegetables in July and August before transplanting them later in the month and September. This will prepare them for the cooler temperatures in autumn. They will also be ready for harvest at this time through the next early spring. 


Warm-season vegetables

The warm-season vegetables like tomatoes, squash, eggplant, legumes, peas, cucumbers, peppers, and corn can get busy in the greenhouse in March and April. However, remember that some areas can experience frost even into spring, so the middle of April or the beginning of May is more ideal for these crops. Because warm-season vegetables can’t tolerate cold temperatures, it’s best always to check the conditions in the greenhouse beforehand. 


Know your seasons


Late winter to mid-spring

You can start growing hardy plants in the greenhouse from late winter to early spring. If you have a heated propagator, you can sow some other plants early as well. Additionally, you can sow fast-growing tender vegetables in mid-spring.


Late spring to late-summer

Late spring to early summer is the best time to plant summer vegetables, and then you can harden them after the frost. By mid-summer, you can harvest summer crops and remove spent vegetables like cucumber. By late summer, you can sow vegetables like lettuce, baby carrots, and salad leaves in the greenhouse for a new harvest. 



By autumn, you can plant some vegetables like parsley and calabrese indoors. Some crops like peas are also best for overwintering. In Maine, you can plant leafy greens in fall, and cruciferous vegetables are even suitable for early August planting. 


Is Year-Round Greenhouse Planting Possible?

Year-round greenhouse planting is possible because you can control the conditions indoors for your vegetables. In states like Colorado, you can even seed cold-tolerant crops in February without supplemental lighting. Greenhouses also work best to start most plants until you can transplant them outside. 

You can then seed warm-season crops and harvest cold-tolerant crops around March or April. May can also be the month of harvest for leafy greens and for transplanting the vegetables you started indoors. Still, it’s best to have a cooling system to prevent overheating on your warm-season crops for June to July.

August to September is for winter gardening, while November to January might require supplemental lighting as the day length shortens. Overall, you want your plants to mature by November or December so that you can still harvest slowly through winter. And depending on your area, the greenhouse can protect your vegetables against frost in the winter. 



The most significant advantage of greenhouse gardening is that it makes it possible to be productive year-round. But do you know when to start growing vegetables in a greenhouse? In states like Colorado, it’s possible to sow or plant as early as February. 

Upon knowing your planting zone, seasons, and crop classifications, you can plant in the greenhouse regardless of the conditions. You can use the greenhouse to protect against frost or start some vegetables indoors until the outdoor climate is suitable. 


Leave a Reply

Your email address will not be published. Required fields are marked *

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.


Leave a Reply

Your email address will not be published. Required fields are marked *

Sign up to our newsletter!