Weed Seed To Harvest

Harvest is just around the corner for many Iowa farmers and now is a good time to consider options to reduce movement of weed seed between fields with harvest equipment. While we may not think of it during harvest time, combines are extremely effective at transporting seed from field to field. A few precautions leading up to harvest and during harvest can help manage any escaped problem weeds. How to grow cannabis in summer after a late start. Read our full guide on germinating cannabis seeds in July and growing cannabis in the summer. Marijuana plant cultivation needs many conditions in care and environment that change according to each step of the weed growth process.

Harvest Considerations to Reduce Weed Seed Movement

Harvest is just around the corner for many Iowa farmers and now is a good time to consider options to reduce movement of weed seed between fields with harvest equipment. While we may not think of it during harvest time, combines are extremely effective at transporting seed from field to field. A few precautions leading up to harvest and during harvest can help manage any escaped problem weeds.

Prior to harvest, scout fields for escaped weeds since weeds are easier to see after crops have matured. This is important to identify problem fields or areas for next year. Your notes about weed problems are critical to choosing effective management tactics for next year, so make this a priority prior to harvest. In some situations scattered weeds could be removed from the fields prior to harvest. It is much easier to manage weed issues before they drop mature seed or before that mature seed goes through a combine.

Waterhemp is an example of a potentially herbicide-resistant species that may need to be contained, especially when it is out of control in only a few fields on the farm. Palmer amaranth and burcucumber are examples of two species that may be either new or in few enough fields that it is valuable to prevent them from spreading further. These species are especially difficult to manage and preplanning harvest can help reduce problems in future years.

If weeds cannot be rogued prior to harvest, decide whether planned harvest order needs to change to avoid spread of certain species to other, uninfested fields. Another precaution when harvesting fields, especially given all the drowned out spots from this spring’s rains, would be to harvest around those areas in the field. These steps are especially important if fields are suspected to have herbicide resistant weeds that are not present elsewhere on the farm or if the fields have a new or unusual species that should be kept from spreading to other fields.

Harvest equipment can carry significant material, including weed seed, between fields.

Finally, steps should be taken to minimize movement of weed seed between fields on harvest equipment. In the future, new technology like the Harrington Seed Destructor (HSD) will make weed management at harvest simpler, but until then, relying on good clean-out practices is necessary in some situations. Combines can retain more than 150 pounds of biomaterial including crop seed, plant material, and weed seed after it has been run empty. A few short steps to perform a self-cleaning of the combine and about 20-30 minutes of time before moving on to another field can help further reduce movement of new weed problems to another field. Read more about those steps in our between-field combine clean-out document.

Links to this article are strongly encouraged, and this article may be republished without further permission if published as written and if credit is given to the author, Integrated Crop Management News, and Iowa State University Extension and Outreach. If this article is to be used in any other manner, permission from the author is required. This article was originally published on September 10, 2018. The information contained within may not be the most current and accurate depending on when it is accessed.

Can I start seeds in July and harvest in October?

Yes you can! Although most growers would, perhaps correctly, point out that a July start is a little late if you are aiming for maximum yield. Many outdoor growers would hope to germinate their cannabis seeds a couple of months earlier than July in order to give their plants the best chance of reaching their true genetic potential.

That said, you can germinate your seeds in July and still get a good quality harvest. If you are interested in knowing more about how to grow cannabis in summer, even after a late start, we have some great tips and info.

“When is it too late to plant cannabis for summer?” is a common question from outdoor growers. The answer depends partly on your local climate and the type of cannabis seeds you are hoping to grow.

With some expert advice on the best type of seeds for your situation (autoflower seeds vs feminised seeds), growing cannabis in summer is very straightforward. Lots of people get great results and so can you!

Pros and cons of starting cannabis seeds in summer

The summer solstice (longest day) is June 21st (Northern Hemisphere) and December 21st (Southern Hemisphere). Regarding the summer solstice, cannabis is generally recommended to be planted outdoors before the solstice. This remains good advice, but for many growers it is also possible to plant your cannabis seeds after the summer solstice and still get a harvest in the autumn/fall.

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Advantages of seeding cannabis in July for northern Hemisphere growers (or January for Southern Hemisphere growers):
  • The warm summer weather has already arrived, your growing season is already here!
  • No risk of losing your seedlings due to an unexpected late frost.
  • Guerrilla growers will already have lots of wild plants growing rapidly, perfect to hide your cannabis plants behind!
  • There is still time left for a harvest, even if it’s a slightly shorter remaining grow season.
  • You can look forward to seeing your plants thrive outdoors immediately in the mid summer conditions.
The disadvantages of starting cannabis seeds in July also need consideration:
  • In general, your soil will be drier for your seedlings. Root growth is more difficult in dry soil so watering needs to be more frequent while the plants are young and more vulnerable to the heat.
  • Black plant containers can become extremely hot in direct sunlight. In the worst cases this will bake the root ball, dehydrating the soil and the plant. This can kill the plant within a day or two. Keep plant containers in the shade, perhaps wrapped in a reflective white cover. Avoid putting plant containers on hot tiled surfaces.
  • Plants germinated late in the season will likely be smaller than they would have been with an earlier start. This will mean smaller yields.
  • Young plants may not cope well with direct midday sun in the hottest part of summer. Consider living them some shelter/shade from the sun between midday until around 4-5pm in extreme conditions. Perhaps under a tarpaulin or similar.
  • With a short vegetative period the root network of your plants won’t be as deep or extensive as it would have been with a long vegetative period. This means you will need to give extra consideration to watering your plant more regularly.

How to grow cannabis outdoors in summer

Look for a private area where you can plant your cannabis seeds and allow them to develop without risk of discovery. Outdoor cannabis growers often have several guerrilla grow locations, just in case one of them is discovered. Unused field corners, waste urban land, river banks, hillsides etc all make great potential locations.

If local soil quality is poor you can supplement it with supermarket soil, well-rotted manure, general fertiliser etc. You can easily make a cannabis organic summer soil mix by blending some quality compost with some slow release organic nutrients such as those from BioTabs. Or you could add your own ingredients to enrich local soil e.g. bone/fish/blood meal, seaweed, worm castings, bat guano etc. If you can grow cannabis on your own land, balcony or patio that makes it easier to monitor plant development.

“How often should you water outdoor cannabis plants during summer” is another common question. In times of hot weather it is normal to water both at morning and night. If you use a larger plant container the roots have a larger available root space of moist grow medium which will allow your plant to manage for longer periods with watering.

If you root your plant directly into the moist earth (without a container) it allows you more latitude, you may need to water less frequently since the roots can source their own water unless in severe drought. When growing in containers you can assess the remaining moisture levels by lifting the container (if possible) to assess the weight. Or you may prefer to use a hygrometer in your plant container to measure moisture level in the root zone.

Growers in extremely hot regions often ask whether will cannabis grow outdoors in summer, in the south with hot temperatures. Unless temperatures are regularly hitting 35-40ºC for prolonged periods then you should be able to get the plants through to harvest.

Planning your grow after a late outdoor season start

If you are aiming to plant cannabis seeds in the summer, most growers aim to get their plants outdoors as soon as the weather is suitable. For growers in northern Europe that can mean waiting until the last frost has passed.

  • At Dutch latitudes, or similar, growers often put their plants outdoors around late May.
  • At southern Mediterranean latitudes you might place your seedlings outdoors in March.

Obviously, an earlier start allows your photoperiod feminised outdoor strains a longer period of vegetative growth and therefore a larger final result. But that doesn’t mean that you can’t start your feminised seeds in July, and accept a somewhat smaller final result.

Autoflowering cannabis seeds are generally recognised as being the fastest, simplest and easiest way to grow cannabis. They can grow from seed to harvest in around 3 months.

Having a spare pack of autoflower seeds in the fridge is always a good idea for outdoor growers contemplating a last-minute summer grow. Check out the Dutch Passion Seed Sale for the latest special offers.

Choosing the best suited seeds for a summer cannabis grow

If you’re planting your cannabis seeds in June or July you need fast growing outdoor strains. Autoflower seeds are particularly recommended for outdoor growers thinking of a late start.

If you plant your auto seeds in June (or early July) you should have a crop around late September or early October. If you can pre-grow your auto seeds indoors for a couple of weeks (under 24 hours of daily light) before planting them out that will speed up your plant development and final size even more.

Choose the faster autoflower strains if you are up against the clock with a late season grow. Some longer blooming autos (e.g. Auto Ultimate, Auto Glueberry) can take a few weeks longer than average, such autoflower strains are probably best avoided if you are on a tight schedule.

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Recommended fast/tough auto strains include Auto Mazar, Auto Blueberry and Auto Blackberry Kush. All will do well outdoors and are fast enough to deliver a harvest even if planted outdoors late in the year.

Photoperiod feminised strains are also a good choice for a late season outdoor grow. Dependable strains such as Frisian Dew, Think Fast and Durban Poison are all recommended.

However, it should be noted that photoperiod feminised outdoor cannabis seeds germinated in July will only have around a month of vegetative growth before starting bloom. This will have inevitable consequences on size and yield. Expect a small/medium sized result rather than a monster outdoor plant.

Watering and feeding schedule for outdoor cannabis in summer

Watering requirements when growing in the middle of summer can be high. Growers in Southern Europe may see heatwave temperatures in excess of 30ºC for long stretches. This can mean watering your plant at morning and night. Some growers leave some water/nutrient solution in a tray underneath their plant container.

This can help the plant from completely drying out. Some growers remove their plant from direct sunlight in the middle of the day, or place the plant in shade to protect it from the worst of the midday heat.

Growers in cooler climates (e.g. Northern UK, Scandinavia) may still face hot temperatures though rarely as high and prolonged as those faced by growers with more Mediterranean climates. Watering and feeding schedules for growers in these regions will vary significantly.

Whether you are growing in a hot or a cool climate you will need to find the right watering schedule for your conditions. Even in the same grow location, outdoor conditions can vary significantly from one year to the next.

Flowering cannabis plants seeded in July

Autoflower seeds germinated in July (Northern Hemisphere) will probably start bloom during August and finish flowering in late September or early October. Many outdoor growers enjoy the often compact, squat and bushy nature of growing autoflowers outdoors. Autos can be easier to hide than 3-4 metre tall photoperiod monsters!

Autoflowering cannabis seeds also do very well in a greenhouse or polytunnel. As with feminised strains, a greenhouse helps protect your plants from the worst of the late-season weather. It’s something to consider if you have significant concerns about the October weather at your grow location/latitude.

Feminised strains planted in July will have a month (or less) before they show signs of bloom. That means it is more realistic to have modest expectations of the final plant size and yield. But even with a July start, you can still harvest some good quality buds in autumn/fall.

Cooling cannabis plants during summer

How to shade cannabis plants in summer? On the hottest days you may want to keep your plants out of the midday sun, if only for a few hours. Cooling cannabis plants during summer isn’t easy.

If grown in a container, move your plant to a shaded area. Some growers create shade for their plants with a tarpaulin, but this isn’t always easy when growing outdoors.

Avoid placing your plants on a hot tiled surface which can greatly increase temperatures in the root zone. Likewise, avoid black plant containers which will heat up in the sun and cook the root ball.

Even when a cannabis plant is badly dehydrated it can often recover after a few hours of cool conditions and plenty of water. After all, people have been growing cannabis in hot climates successfully for thousands of years.

The real issues happen if your plant is in mid bloom and hits a heatwave. Recovering from heat stress and dehydration is easier in vegetative growth then it is in bloom.

Professional growers do have a few options. Increasing CO2 content, for example in a greenhouse, allows plants to tolerate higher temperatures. Some greenhouse growers with blackout blinds equipped on their greenhouse have an easy way to shade their plants if temperatures reach dangerous levels.

Harvesting cannabis plants seeded in July

If all goes well, and it often does, your cannabis plants started in July will be ready to harvest around October. If the late season weather is poor, you may consider creating some kind of shelter/cover to keep torrential rain off your buds. With a little bit of luck you may see your plants grow steadily and supply you with some bonus winter buds.

For those growing in reasonable climates, it is also possible to get an early season auto harvest as well as a late season auto harvest. The following grow review from Denmark shows how even Scandinavian growers can get two successive autoflower harvests each year

Grow cannabis from seed to harvest in 3 months!

Even if you have left it late to plant your cannabis seeds this year you can still get a decent harvest with a short 3-4 month summer grow. Feminised seeds, and perhaps especially autoflower seeds, are great options for growing cannabis in summer even with a late start. If you are thinking about a late season outdoor grow remember it’s easy, secured and fast to buy cannabis seeds online!

4 Stages Of Marijuana Plant Growth

Marijuana plant cultivation needs many conditions in care and environment that change according to each step of the weed growth process.

The taste and quality of your cannabis bud harvest depend on your understanding of the growing marijuana phases and your plants’ lifespan. Take careful notes on when and how you complete each stage of your weed bush cultivation, remarking:

  • Environment, temperature, air humidity;
  • Amount of water and watering intervals;
  • Amounts of nutrients;
  • Pruning and topping timing.
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Well, let’s check out the main phases of growth of cannabis bushes, where you should pay attention while they last and how to improve and accelerate the process of growing marijuana strains. You will find a lot of useful information about marijuana and its cultivation on the Ask Growers.

How Long Does Weed Take To Grow?

First-time growers usually wonder how long for weed to grow? Cultivating a cannabis plant from planting seeds to harvesting buds might take several months, depending on where you cultivate it. Your plant can blossom in only a few weeks if you have an indoor grow space. Weed-cultivator may compel a cannabis plant to blossom, growing it indoors.

Remember that the outside environment would have an impact on your growing area. You may need to install heaters in the cold seasons or ventilation and air conditioners in the heat.

Marijuana plants are annuals, which means they exist for one life cycle and then die. You will be able to collect weed buds for ingestion during the blossoming phase. Cannabis bushes will wither and decay if nobody harvests them within a few weeks of maximum flowering.

What Are A Weed Plant’s Growth Stages?

You must pay attention to several elements of the cannabis plant condition at all stages of a marijuana plant. There are four main weed plant stages of growth:

  • Germinating;
  • Seedling;
  • Vegetative;
  • Flowering/harvesting.

Cannabis Seed Germination (3-10 days)

Marijuana seeds germinate in three to ten days. A weed seed should be light- to dark-brown in tone and feel firm and dried. Undeveloped seeds are mushy and green, white in appearance. They are unlikely to sprout. To ensure that seeds germinate properly, the gardener must ripe them enough. Keep your seeds in a moist and dark place. Some growers would put them in a cup of water covered in a wet paper towel on a shelf.

When you expose the seeds to light and moisture place, it increases hormones and accelerates growth. As the roots mature, the stalk rises, and the first distinctive fan leaves appear, at which time your weed plant is called a seedling.

Seedling Stage In Cannabis Plants (2-3 weeks)

The marijuana bushes require sufficient illumination at the seeding stage. Make sure it gets lots of light for at least 16 hours every day. A strong sprout should be juicy green in color. As a seedling, the germ will grow only one ridged blade of leaves. However, new blades emerge gradually. Giving a specified amount of water throughout the seedling stage is essential. Because the baby weed plant has such a little root system, it is critical not to overwater it.

Growing conditions must be maintained clean throughout this time. Knowing the cannabis breed of the seeds is crucial so you can act appropriately.

Vegetative Stage In Cannabis Plants (3-8 weeks)

The most significant variation in weed growth time occurs during the vegetative stage, after seedling and blooming. A seedling initiates vegetative development when it has seven sets of pointed leaves.

Cannabis’ vegetative stage typically lasts from 3 to 16 weeks. Sativa plants are tall and have fewer leaves than Indica ones, which are smaller and denser. You should move your plant into the big container at this time because the roots and leaves are growing quickly. Growers usually start topping and training bushes at this point.

If you need to know the sex of your seedlings (to get rid of the males), they will begin to exhibit sex organs a few days into the veg stage. Separate male plants so that they do not pollinate the females. It will benefit the plants if you dry out the ground at this phase.

Cannabis Flowering Stage (8-11 weeks)

The cannabis blooming stage is the ultimate stage of weed plant growth, and it is when the plant enthusiast may pick his first yield. As summer transitions into fall, the blooming occurs naturally outside as the plant gets less light every day. Indoor gardeners can induce flowering by decreasing the concentration of sunlight from 18 to 12 hours each day. The blooming stage begins at eight weeks and can last up to 11 weeks, with three distinct phases:

  1. Flower growth. At this stage, the plants’ buds begin to form.
  1. Mid flowering stage. This phase lasts from the fourth to the fifth week. Because the buds get larger, the plants cease growing.
  1. Late flowering stage. The plants grow thick, and the blossoms emit a strong odor. It is critical to regulate the temperature and check the progress in preparation for harvesting.

It is better to harvest when half of the trichomes are translucent. This approach yields the most THC while producing the least CBD.

When Do Buds Grow The Most?

The weed buds appear fully after 8-10 weeks of cannabis bush cultivation. It’s also when the scent of marijuana flowers might get overwhelming!


How long does it take to grow marijuana depends on your conditions and environment. Keep a weed cultivation diary to keep track of your plants’ growth. Examining your notes can help you make the right decisions and increase the effectiveness and amount of your buds’ yield in the following seasons.