How soon will mushrooms appear?

Expect pins roughly one to two weeks after you open the bag and start misting. Harvest usually follows within a few days of pinning, so check daily.

How much light and water does it need?

Give it about 12 hours of indirect light a day and mist once or twice daily with the included pump mister. Keep the bag humid but not soaking.

What temperature does King Blue Oyster need?

It fruits best between 60 and 82°F and should not drop below about 55°F. A normal room temperature works.

Will it produce more than one harvest?

Yes. After the first flush, keep misting and the block can produce additional, smaller flushes before it tires.

Is it safe to grow in a small apartment?

It can be, but oysters release spores as caps mature. Harvest before caps flatten and keep the kit in a ventilated spot away from bedrooms if you are spore-sensitive.

A 5-pound fully colonized spawn bag and a 2-ounce ultra-fine pump mister. You supply the light and a spot out of direct sun.

Midwest Grow Kits King Blue Oyster Mushroom Grow Kit

Best price now

$37.00at TrimleafChecked 1 h ago

Prices are checked against each store and labelled with when.

Visit Trimleaf

Midwest Grow Kits King Blue Oyster Mushroom Grow Kit

Best price now

$37.00at TrimleafChecked 1 h ago

Prices are checked against each store and labelled with when.

Visit Trimleaf

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Price facts

Lowest price today: $37.00 at Trimleaf (checked Nov 10, 2026).

Our take on the Midwest Grow Kits King Blue Oyster Mushroom Grow Kit

A ready-to-fruit indoor mushroom kit built around a 5-pound bag of fully colonized King Blue Oyster spawn. You cut the bag open, mist it once or twice a day with the included fine mister, and give it indirect light; fruiting starts within roughly a week to two weeks at room temperature. King Blue Oyster (Pleurotus eryngii) is the thick-stemmed, meaty relative of the common oyster, with caps that can reach about 8 inches across. Compared with plain oyster kits, it asks for a little more patience and airflow but rewards you with firmer, more substantial clusters, and it is one of the easier kits for a first-time grower.

Best forFirst-time indoor mushroom growersKitchen-counter or windowsill growingPeople who want thick-stemmed culinary oystersGifts for curious cooks and gardeners

Pros

Spawn arrives fully colonized, so no sterile prep or grain work
Beginner-friendly: cut, mist, and wait
King Blue Oyster caps grow large and thick-stemmed
Tolerates a wide 60-82°F room temperature range
Includes a fine-mist pump bottle sized for daily watering
Can produce more than one flush before the block tires

Cons

Needs misting once or twice daily, so it is not hands-off
Oysters release spores that can bother sensitive people in small rooms
Caps grow fast and can drop spores if you wait too long to harvest
Needs 12 hours of indirect light and steady airflow
Yield per flush varies and later flushes get smaller

Midwest Grow Kits King Blue Oyster Mushroom Grow Kit prices at every store

TrimleafNew
In stock
$37.00Checked 1 h ago
Visit Trimleaf

Midwest Grow Kits King Blue Oyster Mushroom Grow Kit price history

Lowest price we've seen: $37.00 on Nov 11 at Trimleaf. Tracked across 1 store since Nov 11.

What reviewers say

Growers describe the kit as genuinely beginner-friendly, with spawn arriving colonized and pins appearing within a week or two of opening the bag. Most praise the size and flavor of the King Blue Oyster caps. Complaints center on daily misting upkeep, spore mess in small rooms, and uneven later flushes.

What people mention

Ease of usePraisedOwners say the fully colonized bag and simple cut-and-mist routine make a first grow straightforward.
Fruiting speedPraisedGrowers report pins appearing within about one to two weeks of opening the bag.
Cap sizePraisedThe King Blue caps grow large and thick-stemmed, which buyers rate as the kit's best feature.
Daily mistingMixedMisting once or twice a day keeps the block happy but is easy to skip on busy days.
Spore messCriticisedOyster mushrooms release spores that can coat nearby surfaces, which some indoor growers dislike.
Later flushesCriticisedOwners note that the second and third harvests are noticeably smaller than the first.

Specifications

Spawn Bag: 5-pound fully colonized
Mister: 2oz ultra-fine pump mister
Mushroom Species: King Blue Oyster (Pleurotus eryngii)
Cap Size: Up to 8 inches diameter
Optimal Temperature Range: 60-82°F
Minimum Temperature: 55°F
Light Requirement: 12 hours indirect light daily

Questions and answers

How soon will mushrooms appear?: Expect pins roughly one to two weeks after you open the bag and start misting. Harvest usually follows within a few days of pinning, so check daily.
How much light and water does it need?: Give it about 12 hours of indirect light a day and mist once or twice daily with the included pump mister. Keep the bag humid but not soaking.
What temperature does King Blue Oyster need?: It fruits best between 60 and 82°F and should not drop below about 55°F. A normal room temperature works.
Will it produce more than one harvest?: Yes. After the first flush, keep misting and the block can produce additional, smaller flushes before it tires.
Is it safe to grow in a small apartment?: It can be, but oysters release spores as caps mature. Harvest before caps flatten and keep the kit in a ventilated spot away from bedrooms if you are spore-sensitive.
What is in the box?: A 5-pound fully colonized spawn bag and a 2-ounce ultra-fine pump mister. You supply the light and a spot out of direct sun.
Where is the Midwest Grow Kits King Blue Oyster Mushroom Grow Kit cheapest?: At Trimleaf, for $37.00, as of our latest check.

Experience Level

Beginner to Advanced