How to Grow King Oyster Mushrooms

Intermediate 45 min 17 steps 22897 views Rating: 4.1/5 Published: 2026-06-13

Cut cardboard into 4 by 4 in (10 by 10 cm) squares and put them in a bucket.. Boil water and pour it over the cardboard until it is completely saturated.. Cover the bucket and let it cool for 8 hours.

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Steps

1

Cut cardboard into 4 by 4 in (10 by 10 cm) squares and put them in a bucket.

Step 1

Cut cardboard into 4 by 4 in (10 by 10 cm) squares and put them in a bucket.

2

Boil water and pour it over the cardboard until it is completely saturated.

Step 2

Boil water and pour it over the cardboard until it is completely saturated.

3

Cover the bucket and let it cool for 8 hours.

Step 3

Cover the bucket and let it cool for 8 hours.

4

Squeeze the cardboard to drain any excess water.

Step 4

Squeeze the cardboard to drain any excess water.

5

Place 10 mushroom spawn on 1 piece of cardboard.

Step 5

Place 10 mushroom spawn on 1 piece of cardboard.

6

Stack the squares on top of one another, placing spawn on each layer.

Step 6

Stack the squares on top of one another, placing spawn on each layer.

7

Place the cardboard squares and spawn into a garbage bag and close it.

Step 7

Place the cardboard squares and spawn into a garbage bag and close it.

8

Keep the bag in an area between 50–65 °F (10–18 °C).

Step 8

Keep the bag in an area between 50–65 °F (10–18 °C).

9

Open the bag after 2 days to check for pools of water.

Step 9

Open the bag after 2 days to check for pools of water.

10

Leave the bag alone for 3-6 weeks.

Step 10

Leave the bag alone for 3-6 weeks.

11

Open the plastic bag once you see white strands covering the cardboard.

Step 11

Open the plastic bag once you see white strands covering the cardboard.

12

Move the bag to a sunny area when the mycelia is present.

Step 12

Move the bag to a sunny area when the mycelia is present.

13

Spray the inner walls of the bag with water twice daily.

Step 13

Spray the inner walls of the bag with water twice daily.

14

Collect the mushrooms before they develop a wavy edge.

Step 14

Collect the mushrooms before they develop a wavy edge.

15

Twist the mushrooms off of their base.

Step 15

Twist the mushrooms off of their base.

16

Spray the bag with water twice a day to get more flushes of mushrooms.

Step 16

Spray the bag with water twice a day to get more flushes of mushrooms.

17

Leave the stems on the mushrooms, if you'd like.

Step 17

Leave the stems on the mushrooms, if you'd like.

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