How Much Veg Space Do You Really Need? | Next Big Crop (2024)

By Aaron Mullins—Systems Coordinator, Next Big Crop

How Much Veg Space Do You Really Need?

Whether you are a craft grower or a large-scale cannabis cultivator, every square foot of your facility matters. How much vegetation space you need, therefore, is a critical question—both for ensuring quality and maximizing efficiency. And when determining the amount of veg space you’ll need, you’ll want to look at a few specific guiding factors, including your grow methodology, how many flower rooms you need to feed, cultivation best practices, and state and local regulations.

Regulatory and Methodology Considerations

Your grow methodology will generally dictate how much space you need. If you only have one generation of plants feeding four flower rooms on a two-week veg schedule, that implies a very different setup than if you have eight rooms on a two-week veg schedule, with two generations of plants at any given time.

A lot of it comes down to your plant count, which is often dictated by the state you’re operating in. Regulations in Arkansas, for instance, only allow 150 plants onsite at any given time. In circ*mstances like this, where you’ll want to get the most out of every plant, it makes sense to vegetate them for 8-12 weeks.

Whereas neighboring Oklahoma has no limit on plant count. Growers in that state are likely running a higher volume and flipping plants over to the flower rooms after two weeks or so. Your plant count will determine the size of your veg rooms as well as the length of time your plants will spend in those veg rooms.

Where are your veg rooms located?

Your grow room setup should be designed to enhance efficiency and protect your mother plants. The flow of your commercial grow setup should always start with the veg rooms. Your vegetation rooms are where you keep your mom plants and produce your clones. If you have the space, you’ll want to separate moms from your clones and from anyone who doesn’t need to be near them. That means having separate veg rooms for moms and clones, if possible, and designing your rooms so employees can pass through the facility without entering the veg rooms, unless they need to.

Sometimes you can make use of your vertical space when you’re running low on horizontal space. Having two or three levels can double or triple your veg space. We don’t advise going above three levels, however, which can slow you down and become a safety concern.

How do I plan lighting for my veg room?

There are many factors to consider when setting up your veg room according to our System Design Manager, Justin Itzkowitz.

Generally, 20% of a single flower room’s light wattage is what’s needed for your veg room. Still, the correct percentage is dependent on several factors. Here are a few questions you need to ask:

  • Are you using HPS (High-Pressure Sodium), CMH (Ceramic Metal Halide), or LED fixtures? Or are you using a combination of light fixtures?
    • You’ll often see HPS lights used in flower grow rooms because they spread light widely and are relatively inexpensive compared to LEDs. In the same operation, you might see LEDs used in the veg room because they emit less heat and allow for a high-density tiered racking model that minimizes a veg room’s footprint.
  • What light models are you using?
    • Each fixture style will spread light and consume power differently.
  • What’s your growing methodology?
    • The appropriate lighting fixture selection depends on your facility design (ex: a veg-in-place model or a handful of flower grow rooms for each veg room or a perpetual harvest model).

Should your veg grow rooms be the same size?

When designing and building out your flower rooms and veg rooms, it’s also important to keep in mind that flower rooms should be a consistent size, so you have a consistent amount of biomass moving through your workflow. Otherwise, managing that biomass can become a much bigger headache than it needs to be.

There is no one right answer for how many veg rooms any grower should have. It largely comes down to your methodology and plant count. Understanding the key variables that go into calculating how many plants you should have in your target amount of veg space is critical to achieving optimal output at your facility.

How many plants can grow in a 10 x 10 room?

The number of plants you can grow in a 10 x 10 room is based on your growing methodology.

Some cultivators prefer to grow large plants, while others prefer small plants. In one tier, you can grow up to 100 plants in a 100 square foot area.

Most cultivators utilize roughly 70% of a room’s floor space as the canopy. In this scenario, a 10 x 10 room can hold up to 70 plants.

Efficient facilities take advantage of tiered growing systems. Each tier increases production capabilities and can triple a room’s canopy.

When you hit three tiers, it’s more cost-effective to increase canopy size in other ways, like additional floors or a larger facility.

Can you veg and flower in the same room?

You can veg and flower plants in the same room, although we don’t recommend the practice for commercial facilities.

Here are a few reasons why:

  • Veg plants are significantly smaller than flowering plants. You can store veg plants close together to reduce their overall footprint, which has the added benefit of maximizing light; with a dense canopy, more light hits each plant and reduces electricity consumption.
  • Veg and flowering plants have different environmental needs and thrive under different temperature and humidity settings. If you veg and flower in the same room, you’ll need a dehumidification system that covers a wide range of humidity and temperature settings to satisfy the needs of both veg and flowering plants. These systems are more expensive.
  • With a designated veg room, you can reduce infrastructure costs by sizing HVAC equipment for the environment.
  • In optimized facilities, most of the production space is designated for flowering plants (they produce a sellable product). Designated veg rooms are smaller than flowering rooms – you can use the extra room for additional flowering space.

Have more questions?Contact our Facility Design team

How Much Veg Space Do You Really Need? | Next Big Crop (2)

About The Author
Aaron Mullins is a certified electrical journeyman and Systems Coordinator for Next Big Crop. He has led design and installation of automated systems for facilities from 10,000 square feet to more than 200,000 square feet. As Systems Coordinator, Mr. Mullins oversees facility design and defines scope, goals and deliverables for all Next Big Crop building projects.
How Much Veg Space Do You Really Need? | Next Big Crop (2024)


How Much Veg Space Do You Really Need? | Next Big Crop? ›

Some cultivators prefer to grow large plants, while others prefer small plants. In one tier, you can grow up to 100 plants in a 100 square foot area. Most cultivators utilize roughly 70% of a room's floor space as the canopy. In this scenario, a 10 x 10 room can hold up to 70 plants.

What is the difference between veg space and flower space? ›

Veg Room – seedlings are transplanted into larger containers so they can grow and mature. Flower Room – mature plants flower and are prepared for harvest.

How big of a grow tent do I need for 4 plants? ›

Finally, we have the conclusion, a 4x4x6. 5ft (120x120x200cm) grow tent is the best choice for 4 Plant plants. In this way, we can know what sizes of grow tents are needed for different numbers of plants.

How many plants are in a 5x5 grow tent? ›

If you do SOG, you can get 25+ small plants in a 5 by 5 space. ✿ If you like to let your plants get larger, you could grow 4 fairly large marijuana plants in one of these tents. Some even grow a single huge plant in a 5x5. And you need different pot size for different strain.

How much veg space do I need? ›

Some cultivators prefer to grow large plants, while others prefer small plants. In one tier, you can grow up to 100 plants in a 100 square foot area. Most cultivators utilize roughly 70% of a room's floor space as the canopy. In this scenario, a 10 x 10 room can hold up to 70 plants.

Can you veg and flower in the same room? ›

Due to their different lighting and climate needs, you cannot veg and flower cannabis in the same room at the same time. Keep this in mind when planning your facility layout and harvest schedules.

How much yield does a 4x4 grow tent make? ›

On average, a 4x4 grow tent can yield between 4 to 8 ounces of dried buds per harvest, usually occurring every 3 to 4 months. However, this yield can be increased to around 10 to 16 ounces by optimizing the growing conditions and using high-quality equipment.

How many plants can I veg in a 4x4 tent? ›

By using the SOG method, each plant only needs about 0.5 square feet of space, meaning, in theory, you can grow 32 plants in a 4×4 grow tent. But be aware, when a plant goes into bloom, they usually grow 2-3 times the size of vegetation, so 16 plants will likely be a better target.

Are grow tents worth it? ›

Better light levels and cheaper running costs

Most grow tents use a reflective mylar interior coating to boost light levels – minimising input costs – so you save money on your bills. Plants need light to give them life, and the more you can give (from every angle), the better they'll grow.

How many tomato plants in a 4x4 grow tent? ›

A 4ft. x 4ft. raised garden bed gives you 16 square feet of growing space (more if you add some trellises for vertical space). That means you can grow around 10 to 11 indeterminate, or vining, tomato plants in one raised bed—if you really love cherry tomatoes, that is.

What is the most popular grow tent size? ›

The most common sizes of grow tents range from 2x2 feet to 10x20 feet.

How many lights should I have in my grow tent? ›

How many LED grow light watts are required per square foot of grow area?
Grow Room SizeSquare FeetVeg Wattage
1' x 1'120 watts
2' x 2'480 watts
3' x 3'9180 watts
2' x 4'8160 watts
6 more rows
Mar 5, 2021

What is the difference between vegetative and floral? ›

Answer: Flower is the seed-bearing part of a plant, consisting of reproductive organs (stamens and carpels) that are typically surrounded by a brightly coloured corolla (petals) and a green calyx (sepals). Vegetative shoots consist of stems and leaves.

What is the difference between veg and flower? ›

Simply put, the vegetative stage is when the cannabis grows. The flowering stage is when cannabis begins to produce fruit. Understanding how long each stage should last and knowing when to help your plant transition to the next stage is key.

What is flower spacing? ›

The recommended spacing is how much space one plant takes up or the space you will need between each hole in the ground when planting. Plants need to be spaced a certain distance from one another to allow space for them to grow. Sometimes this is referred to as "on-center" or "o.c." spacing.

What is a veg room? ›

The Veg Room is where baby plants from the nursery become teen plants. They are grown to maturity before being moved into the flower room. The majority of the cannabis plant's leafy growth and elongation will occur in veg.


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