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A basket full of vegetables and the text: Greenhouse Gardening For Beginners - Where do I start?

Greenhouse Gardening For Beginners – Where do I start?

Table of Contents

Have you installed your greenhouse and are you now thinking about growing in it, except that you have no idea how? Do you imagine harvesting your own homegrown fruits and vegetables, but just don’t know where to start? Are you looking for a beginner’s guide to greenhouse gardening? Then we got you covered! Trial and error can be an essential ingredient of the learning process and patience is indeed power. With this compiled Greenhouse Gardening for Beginners’ manual, you will discover how to manage a greenhouse efficiently.

We understand that you have numbers of puzzles in mind. Slow down. We can assist you along the way in your journey.

Growing in a greenhouse can be so much fun for beginners and experienced gardeners alike but before you pick the plants you fancy to grow, examine and research what conditions, temperatures, and moisture your plants will require to flourish. This is a crucial step in order to make your plans thrive.

Easy plants for greenhouse starters

So what should you start with? What can you grow in a greenhouse? The answer is simple: Literally everything. But there are some plants that thrive easier than others. Begin with these simple plants and develop your knowledge in order to make your first experiences:

  1. Radishes
  2. Peas
  3. Strawberries
  4. Garlic
  5. Leafy greens like lettuce
  6. Tomatoes
  7. Onions
  8. Potatoes
  9. Sunflowers
  10. Mushrooms

Our easy-to-master pointers below can assist you in how you can use your greenhouse’s potential at its best. Take advantage of every equipment and accessories and it will give you numerous ways to make use of your greenhouse.

By following this basic Greenhouse Gardening for Beginners Guide, you will be more successful and face fewer difficulties – including those on temperatures, insects, water, food, space, light, air, and soil. If you are fresh to gardening, do not be extremely aggressive. Take it one step at a time. We have prepared simple tips for you to start your green thumb journey.

Old, vintage-looking greenhouse with plants inside

The Essentials for Beginners – Greenhouse Gardening 101

1. Starting seeds

A greenhouse is an excellent controlled environment, especially when you need to extend the growing season for seasonal plants. You can even grow certain veggies all year round. But again you may still be wondering, “Where do I start?”. Now let’s start with seeds.

Starting seeds normally happens in plain level seed trays, hydroponic trays, or single plug trays. They are prepared depending on their particular needs, for example, they may be immersed overnight, stratified, and then set in trays inside the greenhouse.

To do this, you need to understand the following greenhouse gardening basics for seasonal crops:

  • Be seed smart
  • Get a listing of what you’d wish to plant
  • Invest in containers
  • Get sterile soil to prevent plant diseases and pest infestation
  • Add fertilizer to your soil
  • Always water your plants as recommended for each individual plant
  • Check if your climate can handle these plants
  • How much sunlight are you getting

For beginners, it is important to identify the label and date per seed planted and record entries on the seed packets to recognize the plants easier. Start a little and allot your time to the seeds properly. Review the germination rate on the seed pack to decide how many seeds will provide you with the expected quantity of seedlings.

Hybrid seeds

Hybrid seeds are a healthy option because they are accessible at any garden stores. They are generally identified as F-1 by seed companies. Hybrids crossbreed two similar plants. Here are some more pros and cons of planting hybrid seeds:


  • They are bigger and healthier plants that look more identical.
  • They have greater and more consistent production.
  • You can harvest earlier than expected with improved yields.
  • They are not really influenced by ecological stress, pests, and diseases.


  • They are more expensive compared to other seeds.
  • Seeds from hybrid plants cannot be stored longer.
  • Some assume that the result is not that appetizing.
  • They will not be like their parent plant.

Heirloom seeds

Heirloom seeds are gardeners choice. You simply cannot defeat the flavor of heirloom vegetables. Heirloom types were produced particularly for their awesome flavor.


  • They produce a genetic variety for future cultivation.
  • The seeds are usually adjusted to the local environment.
  • They are passed on for generations.
  • Great for seed swaps.
  • Gardeners can keep the seeds for another year.
  • They are stable.


  • Your plants will not be quite like each other.
  • The cross-pollinated species must be separated.
  • Unusual plants must be removed.
  • It is difficult to buy some varieties in some stores.
  • There is no hybrid vigor.
Greenhouse from outside and inside with the text: Beginners guide to greenhouse gardening

Seed labels and their meanings

The government expects that every seed set that is offered for sale should be accurately labeled. It helps you buy the best quality that will satisfy your needs.


These seeds are also called true-to-type which will produce a true plant. It means that they will generate plants that are related to their parent plant which is essential for seed conservation.


These seeds came from plants that followed the USDA organic standards of a certain territory or region.


These seeds are not grown with “recombinant DNA technology”. Non-GMO seeds are developed through specific or random pollination.


GMOs cross genes from separate plant kingdoms. Any type of seed can be GMO or open-pollinated, hybrid, and heirloom unless it is approved organic or non-GMO.

Percent germination (germ)

This shows how many seeds will sprout easily.

Hard seed

These seeds that don’t develop readily because of a thick seed coat.

Dormant seed

These seeds don’t sprout readily because it needs a pre-treatment or weathering.

2. Temperature control

Another lesson for greenhouse gardening beginners you must learn revolves around temperature control. Identify precisely what is happening inside your greenhouse.

You already have a head start with controlling the temperature of your garden by just using a greenhouse, however, no matter what you are growing you should consider getting an electric or gas heater to extend your growing season through the winter months or an Evaporative Cooling System to make it through the summer months depending on where you live.

In warmer months, you must keep it cooler in order for plants to survive. Moisture within a greenhouse is nearly always close to the peak due to the volume of greenery. Leaves generally perform a method called transpiration, in which they discharge moisture within the environment from pores in their exteriors.

It is essential to convince your plants that they are in a different climate. Greenhouses are intended to trap the warmth from the sun. If no one modified the temperature, it would keep rising or falling depending on the weather.

Its own environment is uniquely dependent on you. You should ensure that whatever heater/cooler you decide to acquire is economical, to keep your bills down.

Evaporative cooling helps regulate temperature and operates to add moisture back. It works perfectly in environments where the atmosphere is hot and dry similar to places like Arizona, Colorado, and California. Have a look at our evaporative cooler here!

A heating system needs to be effective to sustain the desired temperature throughout the daytime and nighttime. A programmable heater with automated timers is required if the temperature normally drops below a particular period. Gardening experts also advise that these heaters are useful for propagating seeds and seedlings in cold weather. You can even opt for propagating heating mats to further cut down on your energy bills. Learn more about the best greenhouse heaters here!

Greenhouse heater as an essential accessory for greenhouse gardening beginners

3. Light

There are some things a greenhouse cannot achieve. One of them is making days lasting. Most of your plants require light to flourish because the light is vital for photosynthesis. But not every light is alike. You should analyze the following aspects:

  • The variety of plant being grown
  • The season
  • How much daylight is achievable

Plants react in a different manner to the intensity and span of light. As plants develop and grow the number of leaves, the demand for light rises. Most of the light utilized by plants is in the noticeable light spectrum. Red and blue colored light are the wavelengths of light most widely used in photosynthesis. They are ingredients of white light or sunshine. Numerous man-made light sources have diverse color blends that may or may not suffice the photosynthetic requirements of your plants.

In summer and late spring, your greenhouse should receive adequate light for plant germination and growth. However, if you wish to plant in winter or late autumn, you might want to invest in an additional lighting system.

LED grow lights and fluorescent lamp strips are high-output lighting products that will serve you well in this regard. They are a crucial element to photosynthesis and satisfactory plant germination. They are particularly effective because they will cover a larger surface area and output the full spectrum of light your crops require.

Supplementing grow lights is the best alternative if you live in the North and don’t receive several hours of winter sunlight. Application of grow lights to extend the day’s period will be very beneficial. Whether you simply need to provide your specific plant a boost, or you intend to grow right over the winter, this will be an excellent choice.

Fluorescent lighting is commonly used in the greenhouse simply when a weak natural light is possible. It is applied in propagating spaces or germination room that experience no natural light.

Check out our greenhouse grow lights collection here!

Long grow light for greenhouse

4. Watering

There are certain watering systems and techniques depending on your plants but the basic rules of greenhouse gardening for beginners dictate that you understand the water requirements of every plant you intend to grow. Instead of watering your crops using a general timetable, learn what is required to ensure you do not over or under-water your crops.

Signs of inappropriate watering include irregular drying, decreased shoot, and root growth and immature plants with bad quality and shelf life. This can also increase the usage of pesticides and growth controls to compensate for incorrect watering routines.

Soil irrigation system for planters in greenhouse

Not every plant wants the same volume or frequency of water. Over or under-watering can make plant dilemmas. Overwatering doesn’t happen when your plant is given huge amounts of water at a time. It happens when water is done too often before the soil has an opportunity to drain. To stop this, you may install a drip system, which can be utilized to regulate greater or smaller streams of water straight to pots or flat grounds. You can set this kind of water with a timer and drip gauge.

Check each plant for its watering requirements. If the plant appears light then it requires watering and if the compost is dusty and dry it means that water is necessary. Remember that it is the roots that require access to water and not the leaves. Sprinkling the leaves is a misuse of water and may increase the scope of the disease.

Check out our greenhouse watering systems here!

5. Accessories

Apart from these accessories above, many other accessories and supplies will make your work easier. Depending on your budget and commitment, you can add mist systems, fans, tool racks, potting benches, and shelving, along with many other accessories to make your job easier.

One of the greenhouse gardening basics to keep in mind while shopping for these accessories is to consider what your plants need, what you would like to have, and the amount of space your greenhouse provides.

For example, some plants require a slow steady supply of water from a drip irrigation System in order to maximize their growth while other can handle general watering techniques with no adverse effects on their growth.

Here are some basic greenhouse accessories that you may need:

  • Shelvings are excellent space savers for small greenhouses. It is important for maintaining your greenhouse neat and organized. Pick the right shelving for your greenhouse here!
  • Fans can serve various purposes inside an enclosed structure. Small fans help with bug and pest problems by drying up excess dampness or condensation. Larger fans can do everything and more. More particularly, they assist in purifying and even cooling your structure, especially when matched with the suitable ventilation systems. Find the perfect ventilation system here!
  • A simple thermometer, like this one, may be a tiny accessory, yet it is unquestionably one of the most critical when it comes to greenhouse gardening. Some plants thrive best in particular temperatures, a thermometer will help to ensure the precise temperature is reached and if it falls under a safe limit.
  • The demand to regulate the daylight getting into the glass is properly reached by the application of shading. It is particularly used to nourish plants that do not require a lot of light to grow. Check out our shade cloths here!
Shelving inside a greenhouse with plenty of plants growing

Pests control for greenhouse starters

A greenhouse setting favors the fast spread of pest populations. The friendly, humid environment and plentiful plants in a greenhouse give an attractive, steady habitat for pest growth. Immediate discovery and analysis of pests are required to execute the appropriate pest control decisions before the issue gets out of hand and you may experience financial loss. You can find all our organic pest control posts here!

These are the top pests to look out for:


Everyone knows aphids. These delicately colored, soft-bodied insects that fill the leaves of your beloved and precious greens. Take a peek at the bottom of the leaves, this is where aphids prefer to gather. Careful pruning and cleanliness are solid habits to stop aphids from damaging your precious plants.


Thrips vary in color from brownish to black. Thrips may leave damage extending from moderate to critical. You may stop these invasions by using screens on vents, examining new supply entering your greenhouse and regulating weeds will help to control thrips.


Bloodworms are elongated, roundworms comparable to fungus gnat larvae in lacking limbs and having a well-defined brown head. The red color is because of the appearance of hemoglobin, just like in human blood. The existence of hemoglobin lets them grow in water with extremely low oxygen content.

Slugs and Snails

Slugs and snails may increase when the moisture is high. These are nocturnal, fleshy, and slimy creatures. Cleanliness is necessary for slug and snail control. make sure your greenhouse is free of plant wastes like uprooted weeds, leaves, used boards, bricks or rocks that give a cooling and moistened hiding spots.

Greenhouse Gardening for beginners - Greenhouse in a green garden

Common greenhouse gardening mistakes

The actual system of nurturing plants in a greenhouse needs a bit of confidence and ability. It may require a little practice beforehand so you won’t get caught up in one of these common greenhouse gardening mistakes. Here are some things to watch out for.


One of the significant mistakes inexperienced gardeners make is skipping to observe their greenhouse temperature on a regular basis. Use a basic thermometer, or buy a digital thermometer that also has the corresponding humidity, which is so crucial to identify for stopping heat loss.


Too much humidity may let mold, mildew, and bugs to run wild in your greenhouse. Too little will make your plants die of thirst. Misting is the best approach to improve humidity.


If your greenhouse has limited or no ventilation, your plants may die. You can utilize roof vents to release the warm air. Or sometimes a small fan may be required to keep sufficient air circulation.


Soil control is important, but it includes some additional challenges. Aside from the basics of combining compost and fertilizer occasionally, think of applying a blended soil mixture when preparing your bases. Do not apply old potting soil, which will carry pests and disease.


Roots from neighboring trees can invade your plants from underground, feeding up nutrients and moisture that is intended for your plants inside your greenhouse. It can also dump leaves or branches all year round. Shades can be a constant obstacle in restricting light as well. To care for your structure and plants, do not place your greenhouse near trees or position it accordingly.

The tips above will get you started on your blooming greenhouse gardening journey and ensure that your investment in a greenhouse is worth all the time, money and effort you put into your greenhouse. Having a greenhouse means any season is a planting season. Savor the excitement of having your homegrown fruits and veggies on your dining table. Have fun gardening all year round!

Do you have any questions or anything to add? Join our discussion by leaving a comment, question, query, or suggestion in the section below.
Picture of Jesse James
Jesse James

Jesse James, an Army Veteran, now shares his passion for gardening through engaging articles on Greenhouse Emporium. Leveraging his experience and love for nature, Jesse provides practical advice and inspires others on their gardening journey.

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