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NLR - Mushroom Growing Kits


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Grow delicious crimini, oyster, portabella, or white button mushrooms at home with these all-inclusive kits - just add water!


Mushroom Growing Kits

Our Mushroom Growing Kits include everything you need to grow several crops of mushrooms at home over 8 - 10 weeks. Just add water and wait for the mushrooms to grow. The first crop of mushrooms is generally ready to pick within just 3 - 4 weeks.

Note: Mushroom yields vary with the temperature in which they are grown. They grow more quickly in warmer temperatures and more slowly in cooler temperatures. They should be harvested in a timely manner for maximum production.

Choose from Crimini (V320), Oyster (V319), Portabella (V317), or White Button (V318).

Crimini/Baby Bella Mushroom Growing Kit

  • The crimini/baby bella mushroom is one of the tastiest mushrooms ever grown. It is very versatile in its uses, and its high solid content makes it a meaty and wonderful mushroom to cook with. When harvested young - in the button stage - it is called a crimini or baby bella and can be used in the same way as the regular white button mushroom. When harvested as a mature mushroom - with the gills exposed - it is called a portabella. Caps grow 1 - 3" in diameter.
  • Contains: Inoculated mushroom compost, casing and instructions - just add water
  • Best growing temperature: 63 - 68°F
  • Available September 1 - May 21

Oyster Mushroom Growing Kit

  • This is a wonderful eating mushroom that grows fast and fruits several crops. The mushrooms are silver gray or off-white in color. They are easy to grow and store well in the refrigerator.
  • Contains: Bag of mushroom inoculated cottonseed hulls
  • Best growing temperature: 65 - 68°F
  • Available September 1 - May 12

Portabella Mushroom Growing Kit

  • Consistently grows large portabella-size mushrooms with little to no effort. These mushrooms are thick and can often grow as large as the opening of the mushroom kit.
  • Contains: Inoculated mushroom compost, casing and instructions - just add water
  • Best growing temperature: 63 - 68°F
  • Available September 1 - May 21

White Button Mushroom Growing Kit

  • The white button mushroom is the most widely cultivated mushroom in the USA. It has been bred to produce a mushroom with a uniform cap size and a thin stem. The thin stem reduces waste, since it is the round button cap that is harvested and valued the most. The caps of the mushrooms in the button stage are usually 1 - 3" in diameter, but if left to mature and open the caps can reach a diameter of 5 - 8". This kit can be held for up to 10 days at room temperature before starting. Approximate yield is 4 lbs.
  • Contains: Inoculated mushroom compost, casing and instructions - just add water
  • Best growing temperature: 63 - 68°F (±5°)
  • Available September 1 - May 21

Mushroom Growing Kit Specs

  • 12" L x 10" W x 8" H
  • 12 lbs

Mushroom Growing Kit Instructions

  1. Start Your Kit

    Open the box and remove the instructions and the bag of dry peat moss (casing). Leave the large bag of compost inside the box. If you do not plan on starting the kit immediately, simply fold the plastic bag back down on to itself and close up the box the way it was before you opened it. The Mushroom Growing Kit is designed to be started immediately, but a short delay of a week or two is OK. If you wish to delay starting your kit for a few weeks, store the kit below 50°F and above freezing.

  2. Set Up Your Kit

    Open the cardboard box and leave the box flaps pointing upward. Open the bag of compost, and pull up the excess plastic bag and leave it pointing up in the air. Scratch the entire surface of the compost ½" deep with a nail or fork. Open the bag of dry casing, and add ½ cup of compost to grow large mushrooms or 1 cup of compost to grow smaller, average-size mushrooms and 5 cups (8 oz. cups) of room temperature tap water. Mix the water, compost, and casing together until you have an even, wet mixture. Let the casing sit in its own bag for 15 minutes to absorb most of the water before applying it to the compost.

  3. Apply the Casing

    Spread the wet casing evenly over the entire surface of the compost. Do not pack the casing down; leave it loose and fluffy. The casing should cover all the compost and be approximately 1" deep. Mist or sprinkle the casing with an additional cup of water. Wait about 5 minutes and then scratch or ruffle the entire surface of the peat moss to a depth of ¾" with a nail or fork. The roughness of the casing creates a microclimate where the young mushrooms can form. It is a good idea to write the date you start your kit on the box for later reference.

  4. Growing Locations

    The best location to place your Mushroom Growing Kit will be a room where the temperature stays between 60 - 74°F. Short periods of ±4°F are usually OK. Your Mushroom Growing Kit does not need to be kept in the dark, but under no circumstance should you allow direct sunlight to shine into it. Ambient light can affect your mushrooms' color, but will not affect their taste. Leave the top of your Mushroom Growing Kit open for air ventilation or no mushrooms will grow. It is a good idea to place a few sheets of newspaper under the kit and keep it at least 2' away from furniture or walls, as spores released can discolor objects nearby if mushrooms are not harvested at the right time. It is also important to protect your mushrooms from insects of all kinds, so an indoor location is preferable to an outdoor location.

  5. Water and Maintenance

    Keep the surface of the casing moist. A moderate spray misting or sprinkling of water on the casing surface once a day is adequate. Do not let the casing dry out. Keep your kit out of drafts and away from heat sources. You may water more often if the temperature is warmer than 70°F. Do not cover the top of the kit to prevent the kit from drying out, as this causes air circulation problems and high levels of carbon dioxide.

  6. Mushrooms Begin to Grow

    Within 7 - 14 days after placing the casing on the compost, you will notice the white mushroom mycelium beginning to grow up into the casing. Sometimes the mycelium grows through the casing and covers 20 - 30% of the casing's surface - this is OK. On day 12 - 14 after casing, small ½" diameter mushrooms begin to form on the casing surface. On day 17 - 21 after casing, the mushrooms will be ready to harvest. Mushrooms will just about double in size every day when they are young.

  7. Harvest Your Crop

    The mushrooms can be picked as buttons with closed caps or allowed to fully mature with caps open. A mushroom is mature and ready to be picked when the thin veil covering the gills under the mushroom begins to tear open. The size of the mushroom has nothing to do with maturity; even small mushrooms should be picked when the veil tears open. To pick your mushrooms rotate them a complete turn in place and slowly pull them out of the casing, trying not to disturb the adjacent mushrooms. Do not cut the mushrooms off inside the kit, as this leaves a stem in the casing to rot. Once you have picked your mushrooms, water the casing again with ½ cup of water to replenish the water the mushrooms removed. In 1 - 4 weeks, depending on the mushroom variety and the temperature, another crop of mushrooms will usually appear. Be patient - most kits produce two very large crops of mushrooms and then several smaller fruitings. After picking the second crop of mushrooms, water the kit again with ½ cup of water and then wait for crop number 3.

  8. Contaminants and Insects

    As your kit ages, it is not uncommon to see tiny black flies and contaminant molds beginning to grow on the casing surface. The flies can easily be controlled by coating the inside upper portion of the large compost bag with a thin coat of (only) vegetable cooking oil. This acts as flypaper and they stick to it. Molds usually do little immediate harm and may be left alone until you discard your kit. Just because a few contaminants show up, don’t rush to discard your kit - wait a while to be sure no further mushrooms will grow.

  9. End of Production

    Your kit contains a fixed amount of mushroom nutrients. When these are used up, the kit will stop producing mushrooms and become idle. In time, the mushroom mycelium slowly dies and becomes nutrients for plants. This begins around 12 weeks or later from the time you started your kit. Your kit can then be recycled by adding it to your compost pile or mixing it into your garden for fertilizer.

  10. Caution

    A natural reproductive process for mushrooms is to produce spores. Spores are produced when mushroom caps reach maturity and open, releasing spores. Most of the spores fall and stay inside or around the kit, but some do drift away. If the spores are in heavy enough concentration and close to an item, they may discolor it. Cleanup can usually be done by washing with soap and water. By picking your mushrooms before the veil breaks or shortly after, you will reduce or eliminate the release of spores. The spores are generally harmless to humans, unless you are allergic to fungi.

This product is shipped from one of our warehouses in Northern California. Orders placed after 12 p.m. will typically ship the following business day. Click here to see an estimate of our delivery times with standard FedEx Ground shipping.

Returns & Replacements
Regularly stocked, non-special-ordered, and non-custom-built items can be returned for a refund within 30 days of receipt if unused and in original packaging. Returns of solar panels, inverters or other large ticket items will incur a re-stocking fee of up to 30%. Freight shipping is non-refundable.

For more, please read our full return policy.

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