What Can I Grow In A Greenhouse In July? (Find OUT)

As the days get longer and warmer, it’s time to think about what you can grow in your greenhouse. A greenhouse is a great way to extend your growing season at home, especially if you live in an area with long winters. 

Here are some of the best plants to grow in July:

What Can I Grow In July – Mid Summer Sowing Guide – YouTube
Greenhouses offer opportunities to grow a variety of plants in July.
Tomatoes, cucumbers, peppers, and herbs like basil are suitable for greenhouse cultivation during this month.
Flowering plants such as petunias and marigolds can also thrive in a greenhouse in July.
Proper temperature control and ventilation are essential for successful greenhouse gardening.
Watering and monitoring soil moisture levels regularly is crucial for plant health.
Protecting the greenhouse from excessive heat and providing shade when needed is important.
Keeping an eye out for pests and diseases and taking preventive measures is essential for plant protection.
The specific plants to grow in a greenhouse during July may vary based on climate and personal preference.
Starting seeds in July for later transplanting can be possible for certain fast-growing plants.
Experimenting with different plant varieties and learning from experience is part of the greenhouse gardening journey.


Tomatoes are a good crop to grow in the greenhouse in July.

Tomatoes are a good source of vitamins A, C and K. They’re also high in antioxidants, which can prevent cell damage caused by free radicals that can lead to serious diseases like cancer. Tomatoes provide potassium, magnesium and folate too!

You could plant tomatoes indoors or outside depending on where you live. If you live in a colder climate, try growing them under lights indoors so that they are warm enough to grow quickly during summer months when it’s too cold outside for them to thrive naturally

Maintaining the ideal temperature in a greenhouse is crucial for successful plant growth. Explore our guide on keeping greenhouses warm to discover effective and easy ways to ensure optimal conditions for your plants.


Peppers are a warm-weather vegetable that’s easy to grow. In fact, they’re one of the easiest vegetables you can grow in your greenhouse. 

They’re also a good source of vitamin C, which is important since greenhouse conditions may be drying out your skin and hair (and therefore causing more sun damage).

Peppers can be harvested at any size from tiny to fully grown so if you’ve got limited space or just want something small for a salad, try growing baby bells! Peppers make great pickled or roasted too so don’t let them go to waste by only using them raw.

PepperCommon Varieties
Bell PepperCalifornia Wonder, Red, Yellow, Orange
JalapenoEarly, M, T, TAM, Fooled You
HabaneroOrange, Chocolate, Red Savina
Poblano/AnchoAncho, Poblano, Mulato, Pasilla
CayenneLong Slim, Thai, Super Cayenne


Eggplant is a warm weather crop that requires at least 65 degrees Fahrenheit to thrive. It is a member of the nightshade family, and it grows well in a greenhouse or sunny spot in your garden. 

Eggplant can be grown from seed directly into the soil, or started indoors and transplanted into larger containers before transplanting outdoors. Plant seeds 2 inches deep and 2 feet apart to ensure proper spacing between plants. 

If you are starting your eggplants indoors, place them in individual 1-gallon pots until they reach 3 inches tall and then transplant them into their final growing area outside.

Proper lighting is essential for maximizing plant growth in a greenhouse. Learn about the importance of light and how to provide the right amount with our comprehensive guide on light requirements in a greenhouse.


Potatoes are a root crop and need space to grow. They’re frost sensitive, so it’s important to plant them in late spring or early summer instead of the fall. 

Potatoes can be grown either in containers or in the ground, but if you want to grow them in containers, make sure they’re at least 12 inches deep with drainage holes on the bottom. Potatoes need a lot of nutrients, so give them plenty of compost when planting and keep the soil loose at all times!

Potatoes are thirsty plants—they will drink up all your water if you don’t give them enough! It’s important that they get regular watering while they’re growing. 

If there aren’t any rainy days coming up between now and mid-July (and you live somewhere where it rains often), then consider watering your potatoes every day until rain comes along again.


Herbs are one of the best things to grow in a greenhouse. They can be used for cooking, and they look lovely around your house.

While there are many herbs that you can grow indoors, here are some of the most common ones:

  • Basil (sweet or spicy)
  • Cilantro
  • Rosemary (piney flavor)
  • Sage (slightly peppery taste with a little tingle on the tongue)

and thyme as well as mint! You can choose whether to grow them in pots or directly in soil at home by planting seeds in small pots filled with soilless mix or simply using pre-grown pot plant containers which come ready-to-plant right out of their container!

HerbCommon Varieties
BasilGenovese, Sweet, Thai, Lemon
RosemaryTuscan Blue, Arp, Prostrate
ThymeCommon, Lemon, French, Creeping
ParsleyItalian Flat-Leaf, Curly
Cilantro/CorianderSanto, Slow Bolt, Calypso, Cruiser

Greenhouse Strawberries

Greenhouse strawberries are a type of strawberry that can be grown indoors, in your greenhouse. 

They’re not the same as outdoor strawberries and are different from field-grown indoor-outdoor hybrids. Greenhouse strawberries have smaller berries than outdoor varieties, but they’re sweeter and more flavorful than field-grown plants.

Greenhouse strawberries can be started from seed or transplanted from outdoors once the weather has warmed up in springtime, when you’ll want to make sure that the soil around them remains moist but not wet they don’t like soggy soil at all! 

Watering should only occur when the top 2 inches of soil becomes dry; too much water will cause them to rot quickly due to root rot disease (Phytophthora).

Once your plants have produced runners (strawberry “offsets”), you’ll want to separate each runner into its own pot before planting it outside where they’ll grow best if given enough sunlight exposure during their growing season months of April through September (depending on where you live).

Protecting your greenhouse from water damage is vital to safeguard your plants. Discover simple and effective techniques for waterproofing a greenhouse in our detailed guide.

Greenhouse Cucumbers And Zucchini

Greenhouse cucumbers and zucchini are practically the easiest vegetables to grow. In fact, you can grow them just about anywhere: in the backyard garden or in a greenhouse. They’re great for eating fresh, pickling or drying.

Cabbage Family

Cabbage family crops are easy to grow and require very little maintenance. You can plant cabbage family crops in early spring and harvest them in the fall or you can plant them later, as long as they have enough time to mature before winter. Cabbage family crops include broccoli, cauliflower, Brussels sprouts and kohlrabi.

These plants are considered cool season crops because they grow best when nighttime temperatures hover around 45 degrees Fahrenheit (7 degrees Celsius). 

If you live in a cooler climate with warm summers but cold winters like I do here in northern California then this is perfect for you!

The good news is that these plants aren’t too picky about what type of soil they need—they’re pretty resilient! 

They will tolerate most soils as long as drainage is adequate for the type of garden bed being used (i.e., raised beds work great!). 

However if your soil has poor drainage then add some organic matter such as composted manure before planting so that it will retain more moisture instead of draining away quickly after rainfall events occur throughout summer months.”

PlantCommon Varieties
CabbageSavoy, Napa, Red, Green
BroccoliCalabrese, Romanesco, Purple Sprouting
CauliflowerSnowball, Purple, Romanesco
Brussels SproutsLong Island Improved, Diablo, Prince Marvel
KaleLacinato, Curly, Red Russian

Orach And Spinach

Orach and spinach grow best in a greenhouse during the summer. Orach, also known as mountain spinach or mountain oak leaf lettuce, is an annual plant that thrives when it receives full sun exposure and fertile soil. 

It can be grown from seeds starting in April or May, with the seedlings reaching maturity around mid-July; be sure to space them at least 2 feet apart so they have plenty of room to grow.

Orach loves being watered regularly, but never let its soil get soggy—it prefers moist roots rather than saturated ones! 

As long as you keep an eye on its moisture levels and maintain good drainage in your planter box, then nothing else should go wrong with this lovely little green vegetable.

When temperatures drop, it’s important to keep your greenhouse warm to protect your plants. Find out how to heat a greenhouse using cattle panels with our step-by-step guide on heating a cattle panel greenhouse.

Carrots, Beets, And Other Root Vegetables

Root vegetables are a great way to get started in greenhouse gardening. Carrots, beets and other root vegetables can be grown all year long, but they do best when the weather is cool. In July, root vegetables are typically harvested in the late fall or early winter. 

They need lots of room to grow and take up a lot of space in your garden (as you can tell from the name!).

Root vegetables are easy to grow inside a greenhouse! You don’t have to worry about transplanting them into your garden each year like you would if you were growing them outside during cold months. If you’ve never tried growing root vegetables before then now is an excellent time to start!


Flowers are one of the best ways to grow in a greenhouse. They are easy to grow, and can be grown from seeds or cuttings. Flowers can be used for many purposes including food, medicine, decoration and more!

Planning to build a greenhouse? Our comprehensive guide on building a greenhouse in snow provides valuable insights and tips to help you construct a sturdy structure that can withstand winter conditions.


It’s important to remember that some plants will be available in your greenhouse at different times of the year. Make sure you research what each plant needs before you purchase it and add them to your garden plan!

Further Reading

What to Plant in July – Gardener’s World: Explore a comprehensive guide on what plants are ideal to plant in your garden during the month of July. Discover the best options for a vibrant summer garden.

The Best Things to Grow in July – Shedstore: Learn about the top plants and vegetables that thrive when grown in July. This informative article provides insights on how to make the most of your gardening efforts during this time.

What to Sow and Grow in July – Thompson & Morgan: Get expert advice on what seeds to sow and what plants to grow in your garden during July. Discover tips and techniques to ensure a successful harvest.

And here’s the FAQs section with five questions and answers:


What are the best plants to grow in a greenhouse in July?

In July, some of the best plants to grow in a greenhouse include tomatoes, cucumbers, peppers, herbs like basil and mint, and flowering plants like petunias and marigolds.

How do I protect my greenhouse from excessive heat in July?

To protect your greenhouse from excessive heat in July, you can use shading materials like shade cloth or apply a white wash to the greenhouse panels to reflect sunlight. Additionally, providing proper ventilation and using fans can help maintain a comfortable temperature.

Can I start new seeds in July for my greenhouse?

Starting new seeds in July for your greenhouse depends on the specific plants and the climate in your region. While it may be challenging due to the summer heat, some fast-growing vegetables and annual flowers can still be started from seeds in July for later transplanting.

How often should I water plants in a greenhouse during July?

The frequency of watering plants in a greenhouse during July depends on various factors such as the type of plant, temperature, humidity, and soil moisture levels. Generally, it’s recommended to monitor the soil moisture and water plants when the top inch of soil feels dry.

How do I prevent pests and diseases in my greenhouse during July?

To prevent pests and diseases in your greenhouse during July, practicing good sanitation, proper plant spacing, and adequate ventilation are essential. Regularly inspecting plants for signs of pests or diseases and promptly addressing any issues can help maintain a healthy growing environment.