King Blue Oyster Mushroom Grow Kit (5lbs)
King Blue Oyster Mushroom Grow Kit (5lbs) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Description
Description
Grow thick, meaty King Blue Oyster mushrooms at home with this 5 lb ready-to-fruit block. Fully colonized before it ships — cut the bag, mist daily, and dense clusters develop into harvest-ready mushrooms. No sterile technique, no incubation, no extra equipment.
King Blue Oyster sits between a standard blue oyster and a king trumpet: it produces noticeably thicker, heavier fruiting bodies than an ordinary oyster kit while keeping the fast, forgiving growth that makes oysters good for beginners. If you want mushrooms substantial enough to slice into medallions and grill, this is the kit.
- 5 lbsColonized block
- 2.5–3 lbsTypical yield
- 60–82°FFruiting temp
- MultipleFlushes
- BeginnerSkill level
Why grow King Blue Oyster mushrooms?
- Thick, meaty texture – one of the most substantial oyster varieties
- Rich umami flavor – well suited to gourmet and plant-based cooking
- Beginner-friendly – no special equipment or experience required
- High-yield potential – produces multiple flushes of dense mushrooms
- Cold tolerant – performs across a wide range of indoor temperatures
- Ready to fruit – fully colonized and ready to grow out of the box
What comes in the kit
- 5 lb pre-colonized King Blue Oyster grow block
- Ultra-fine pump mister for daily misting
- Printed step-by-step growing instructions
How this King Blue Oyster kit works
- Cut the bag. Make a slit across the face of the block as directed. Exposure to fresh air is the signal that shifts the mycelium from feeding to fruiting.
- Mist once or twice a day. Light passes over the cut face to keep the surface from drying out. Avoid leaving standing water on the block.
- Give it fresh air. Good circulation is what produces thick stems and broad caps instead of leggy stretched growth. This is the variable that most affects how substantial your mushrooms turn out.
- Add indirect light. Roughly 12 hours a day. Ambient room light or a spot away from direct sun is plenty.
- Harvest, then rest the block. Pick the cluster once the caps are fully developed but before the edges flatten out. Pause misting for about a week, then resume for the next flush.
Getting the thickest possible stems: King Blue rewards patience more than most oysters. Let the cluster size up fully rather than harvesting at the first sign of developed caps — the last few days are when the stems put on the density that makes this variety worth growing. Watch the cap edges, and pick just before they flatten.
Growing specifications
| Specification | Detail |
|---|---|
| Common name | King Blue Oyster Mushroom |
| Block weight | 5 lbs, fully colonized |
| Expected yield | 2.5–3 lbs wet weight across multiple flushes |
| Fruiting temperature | 60–82°F, tolerates cooler conditions |
| Light | Indirect light, roughly 12 hours per day |
| Humidity method | Mist cut face 1–2× daily |
| Fresh air | Important — good circulation prevents long stems |
| Skill level | Beginner — no sterile technique required |
Appearance, flavor, and cooking
King Blue Oyster develops thick white stems with broad caps in shades of blue-gray. The firm, slightly chewy texture is what sets it apart — it is one of the best mushrooms for standing in where you would otherwise use meat.
In the kitchen it is unusually versatile for an oyster. Slice the stems crosswise into medallions and sear them hard; the dense flesh browns properly instead of collapsing. It also grills, roasts, and stir-fries well, and holds its shape in soups and pasta where thinner oysters would go soft. The deep umami flavor makes it a regular in plant-based cooking.
Worth addingIf you are fruiting a block out in the open on a counter or shelf, a portable humidity tent makes a real difference for very little money. It holds moisture around the block so you mist less often and get fuller clusters, and it matters most in winter when forced-air heat drops indoor humidity well below what a fruiting block wants.
Common questions
How long until my King Blue Oyster kit starts fruiting?
Pins typically appear on the cut face within the first week or two after opening the bag, then size up over the following several days. Warmer rooms move faster. Because this variety produces heavier fruiting bodies, the sizing-up stage takes a little longer than a standard blue oyster — that extra time is where the thickness comes from.
Why are my mushrooms long and stringy with small caps?
That is a fresh air problem, not a water problem. Oyster mushrooms stretch toward oxygen, so a block in a closed cabinet, an unventilated corner, or a sealed container produces long stems and undersized caps. Move it somewhere with normal room air circulation. If you are using a humidity tent, open or vent it daily.
How is King Blue Oyster different from regular Blue Oyster?
King Blue produces noticeably thicker, heavier fruiting bodies with more substantial stems, where standard Blue Oyster forms thinner, more delicate fan-shaped clusters. Growing conditions and care are essentially the same. Choose King Blue if you want mushrooms dense enough to slice and sear like a cut of meat; choose standard Blue Oyster for faster flushes and a more tender texture.
Do I need a humidity tent?
No — the kit is designed to fruit in open room air with daily misting. But dry winter air with forced-air heat makes the job harder, and a tent holds humidity around the block so you mist less often and get fuller clusters. If your home runs below about 40% relative humidity, it is worth adding one.
When should I harvest King Blue Oyster mushrooms?
Harvest the whole cluster once the caps are fully developed but while the edges are still curled slightly downward. Flattened, upturned caps mean the mushroom is mature and dropping spores — still edible, but the texture softens. Twist and pull the entire cluster at its base rather than picking individual mushrooms.
What's the difference between this kit and grain spawn?
This kit is a finished fruiting block — ready to produce mushrooms with nothing else required. Grain spawn is an ingredient: colonized grain you mix into bulk substrate to start a much larger grow, typically a monotub or a batch of fruiting blocks. If you want mushrooms on the counter, take the kit. If you are scaling up, start with our pre-colonized grain spawn bags instead.
Our Growing Experts Recommend
Products our growers commonly use with this item
Let customers speak for us
So when i got this i was worried because of past experiences. Leave it up to midwest to be nice a patient with me. The team at bonsai gives great support . This flow hood is meant to run a little higher than normal clean room standards because most people need this working from home . This thing is nice and laminar. Very inform . With a speed contoller i average about .45 m/s across the face. It passed everyone one of my agar grid tests . Which blows my mind becuase i ran it through three diffrent 30 mins agar grid tests . Ive used a few flow hoods and this one is my favorite . Perfect for any home or small buisness.
"Upgraded to the MycoClimate 44Q and the difference in consistency is night and day. The dual-chamber water-bath heating keeps temperatures rock-solid without drying out the substrate like standard heating mats do, and the automated HEPA air pump takes all the stress out of fresh air exchange—even tucked away inside a closet.
i saw germination in my jar within 2-4 days!! I ordered a 3 pack and i injected 3 different strains and they are all colonizing and germinating very rapidly i see ne difference in rate of germination for genetics they are all moving about the same speed im happy with my purchase!
100% RELIABLE EVERY TIME I LOVE YOU MIDWEST THANL YOU TEAM
Reliable and I know what I am getting. Pretty quick colonization.
I got the grow bag instead of jars this time because I am not interested in the steps of the jars.
Been there done that.
I am not an expert🤓 but now I have enough knowledge and experience to call myself an apprentice.
The thrill of the process is gone. Just give me the dam mushrooms.
I am hurry up and waiting😉.
Seems to be working is all I have to say at this point day 7. The green is reflection not mold.
All I knew was I wanted to grow some mushies for me and the boys, I did a bunch of research on companies and you guys have been around the longest and have the best reviews for these types and I was not disappointed. Took exactly 8 weeks to harvest my first 4 ounces and more on the way! Thanks so much for all the awesome guides and videos! Made it so easy!
It's a great monotub kit. I recommend throwing the horse booster, used the whole bag to 4 small quick grain jars and the 7.5 mix. I learned how to do a pf tek with these guys 10 years ago when you still got the sticky light for the lid and the monotub was a blue tub with polyfill. These monotub kits have come a very long way since then. Substrate has always been clean and performed better than what I try to recreate with a pressure cooker.
10cc liquid culture and follow the instructions mgk gives you hard to mess up.
So far , I only have a little bit on agar , and am only beginning to study this mycelium. Super excited to try to put it to use in this Aspen tree.
Everything is looking real good so far
If your ever in need of replacing your hepa filter on your bonsai flowhood these are an exact match to whichever size you have. Worth noting that a filter will actually work a lot longer than is recommended due to physics but if your externals get dirty or damaged it’s worth replacing.
Shipping was lightning fast
I like everything about this setup. The time of ownership is too short to discuss fruiting mushrooms but the incubating mycelium seem to be doing well for now under the recommended temps. The one thing that would make this setup better would be the inclusion of an electronic controlled hygrometer to run the vaporizer.
Unit was just giving 0 on everything except air Temp and Humidity. Called customer and they are taking care of. Happy with customer service.
