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HK-35 Low-Spore Oyster Mushroom Spawn Kit

Original price was: R1,399.Current price is: R995.

βœ” Commercial HK-35 Low-Spore Oyster Mushroom
βœ” Includes 100 mlΒ  Living Inoculant in Reusable Culture Bottle
βœ” Includes 1 kg Sterilized Sorghum Grain Spawn with SHIP
βœ” Aggressive colonization and reduced airborne spore production

Availability: Only 2 left in stock (can be backordered)

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Commercial 100cc Living Inoculant in Septum Bottle + Sterilized Sorghum Grain Spawn w/ SHIP

The HK-35 Low-Spore Oyster (Pleurotus ostreatus HK-35) is a commercial oyster mushroom strain developed for growers seeking reliable production with significantly reduced airborne spores. It combines rapid colonization, heavy yields and attractive grey-to-cream fruiting bodies, making it an excellent choice for both home cultivators and commercial mushroom farms.

Unlike conventional oyster mushrooms, HK-35 produces substantially fewer spores during maturity, helping to maintain a cleaner growing environment while retaining the vigorous growth and productivity for which oyster mushrooms are renowned.

Each Spawn Kit contains everything required to establish your first grain spawn. Once fully colonized, the grain spawn can be expanded into your preferred bulk substrate to produce healthy, productive mushroom harvests.


🌱 Cultivation

HK-35 is an aggressive colonizer that performs well on a wide range of lignocellulosic substrates and is considered one of the easiest gourmet mushrooms to cultivate.

Recommended substrates include:

  • Pasteurized wheat or barley straw
  • Master’s Mix (hardwood sawdust and soy hulls)
  • Supplemented hardwood sawdust
  • Agricultural residues
  • Cardboard and paper fibre

For best results, provide good Fresh Air Exchange (FAE) during fruiting together with appropriate humidity and lighting. Under suitable conditions, HK-35 produces dense clusters with thick, fleshy caps ranging from dove-grey in cooler conditions to creamy beige in warmer temperatures.


πŸ‡ΏπŸ‡¦Β Why Grow HK-35?

  • Commercial low-spore strain
  • Cleaner fruiting rooms with reduced airborne spores
  • Fast, aggressive colonization
  • Reliable and consistent harvests
  • Thick, meaty mushrooms with excellent texture
  • Performs exceptionally well on straw and hardwood-based substrates
  • Suitable for both beginners and experienced growers

πŸ“¦ What’s Included

Each HK-35 Spawn Kit contains:

  • 1 Γ— 100 ml Living Inoculant (LI) containing HK-35
    • Amber laboratory Culture Bottle with reusable 3 mm silicone septum
  • 1 Γ— 1 kg Sterilized Sorghum Grain Spawn
    • Integrated Self-Healing Injection Port (SHIP)
    • 0.2 Β΅m PTFE filter patch
  • 1 Γ— Sterile 5 ml syringe
  • 1 Γ— Sterile 16G needle

Detailed instructions for using your Living Inoculant are provided in the “How to Use LI” tab.

How to Use LI

πŸ§ͺ How to Use Your Living Inoculant (LI)

Your Spawn Kit has been designed to make mushroom cultivation as simple and contamination-resistant as possible. The included Living Inoculant (LI) contains an actively growing mushroom mono-culture, while the Sterilized Sorghum Grain Spawn provides the ideal medium for expanding that culture into vigorous grain spawn.


🧼 Step 1 – Sanitize

Before inoculation, wipe both the Culture Bottle septum and the SHIP (Self-Healing Injection Port) on the Spawn Bag with 70% rubbing alcohol.

Allow both surfaces to air dry before proceeding.


πŸ’‰ Step 2 – Withdraw the Living Inoculant

Using the supplied sterile syringe and needle:

  • Insert the needle through the bottle septum.
  • Withdraw approximately 5 ml (5 cc) of Living Inoculant.
  • Remove any excess air from the syringe.

The Culture Bottle is reusable and can be accessed multiple times using sterile technique, via a 3mm thick silicone septum.


πŸ“¦ Step 3 – Inoculate the Spawn Bag

Insert the needle through the SHIP on the Spawn Bag and slowly inject the 5 ml of Living Inoculant into the sterilized sorghum grain.

Remove the needle and gently massage the inoculation site if necessary.

The SHIP will reseal automatically after the needle is removed.


πŸŒ™ Step 4 – Incubate

Place the Spawn Bag in a clean, dark location at approximately 23–27Β°C.

Do not expose the bag to direct sunlight.

During incubation, the white mycelium will gradually spread throughout the grain.


πŸ”„ Step 5 – Mix the Grain

Once approximately 30–40% of the grain has colonized with healthy white mycelium, gently break apart the colonized grain and mix it evenly throughout the bag.

This redistributes the growing mycelium and significantly accelerates complete colonization.


πŸ„ Step 6 – Use as Grain Spawn

Once the grain is fully colonized (completely white), it is ready to inoculate your preferred mushroom substrate.

Suitable substrates include pasteurized straw, hardwood sawdust, Master’s Mix, and other compatible materials depending on the mushroom species.

For best results, use the colonized grain spawn within 3 months.


πŸ’‘ Tips for Success

  • Work as cleanly as possible during inoculation.
  • Always sanitize the bottle septum and SHIP before each use.
  • Do not remove or damage the filter patch.
  • Healthy mycelium should appear bright white and vigorous.
  • If contamination develops, dispose of the bag without opening it indoors.

♻️ Expanding Your Culture

One of the advantages of the Living Inoculant system is that the Culture Bottle contains enough inoculant to prepare multiple Spawn Bags.

When you’re ready to expand your production, simply order additional Sterilized Sorghum Grain Spawn and repeat the inoculation process using the remaining Living Inoculant.

How to use Living Inoculant (LI)

Weight 1.2 kg
Dimensions 10 × 15 × 25 cm
Culture Type

Mother Spawn, Master Slant, Castellani

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HK-35 Low-Spore Oyster Mushroom Spawn KitHK-35 Low-Spore Oyster Mushroom Spawn Kit
Original price was: R1,399.Current price is: R995.

Availability: Only 2 left in stock (can be backordered)

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