Harvesting & Drying

When and how to harvest your mushrooms, plus drying and storage for long-term preservation.

When to Harvest

Timing your harvest correctly is important. Harvesting too early means smaller yields; harvesting too late leads to spore drop, which makes a mess and can inhibit future flushes.

The Veil

The key indicator for harvest timing is the veil — a thin membrane connecting the cap edge to the stem. As the mushroom matures, the cap expands and the veil stretches and eventually tears.

Ideal harvest time: When the veil is stretched thin and just starting to tear away from the cap, but has not fully broken yet. At this stage, the mushroom has reached its maximum potency-to-weight ratio.
Still acceptable: Just after the veil has broken. The cap will be starting to flatten or upturn slightly.
Too late: If the cap has fully flattened or turned upward and is dropping dark spores. You will see a dark purple-black dusting of spores on surrounding mushrooms and the substrate surface.

Tip: Mushrooms in the same tub will not all mature at the same time. You can harvest selectively — pick the ones that are ready and leave the smaller ones to continue growing. Check the tub 2–3 times per day during active fruiting, as mushrooms can grow rapidly in their final 12–24 hours.

Warning: Heavy spore drop (a dark purple-black powder covering the substrate and other mushrooms) can suppress future flushes by coating the substrate surface. If you see spore drop occurring, harvest all remaining mature mushrooms immediately.

How to Harvest

Twist and Pull Method (Recommended)

This is the simplest and most widely used harvesting technique:

Wash your hands or wear clean gloves.
Grasp the mushroom gently at the base of the stem, as close to the substrate as possible.
Twist the mushroom gently while pulling upward. The motion is like unscrewing a light bulb — a slow, gentle rotation while pulling.
The mushroom should come free cleanly from the substrate, leaving a small hole or depression. This is normal and will fill in with mycelium.
Remove any substrate debris clinging to the base of the stem. A gentle brush or a paring knife trim works well.

Cutting Method (Alternative)

Some growers prefer to cut mushrooms at the base with a clean, sharp knife or scissors. This leaves a small stump in the substrate, which will eventually be reabsorbed by the mycelium. Both methods work — twist-and-pull tends to leave a cleaner substrate surface.

Tip: If mushrooms are growing in tight clusters, it is often easier to harvest the entire cluster at once by twisting and pulling the whole group, then separating individual mushrooms afterward.

Handling Aborts

Aborts are small pins that stopped growing and turned dark at the cap. They are common and normal, especially at the edges of the tub. Remove all aborts during harvest — leaving them on the substrate can attract contamination. They are easily identified by their dark, shrivelled caps and are often bluish.

Drying

Fresh mushrooms are approximately 90% water and will spoil within days if not dried. Proper drying preserves them for months or years.

Dehydrator Method (Recommended)

A food dehydrator is the best tool for drying mushrooms consistently and quickly.

Set the temperature to 50°C (122°F). This temperature is high enough to remove moisture efficiently but low enough to preserve the mushrooms without cooking them.
Arrange mushrooms on the dehydrator trays in a single layer. Do not overlap. Larger mushrooms can be sliced in half lengthwise to speed up drying.
Run the dehydrator for 6–12 hours. The exact time depends on the size of the mushrooms and humidity in your area.
Check for "cracker dry". Properly dried mushrooms should snap cleanly when bent — like a dry cracker. They should not bend, flex, or feel leathery. If they bend at all, they need more time.

Mushroom Size	Approximate Drying Time at 50°C
Small (under 5 cm cap)	4–6 hours
Medium (5–8 cm cap)	6–10 hours
Large (8+ cm cap, thick stems)	10–14 hours (consider slicing in half)

Warning: Do not exceed 70°C (158°F) when drying. Higher temperatures can degrade the mushrooms and cook them rather than dehydrate them. Low and slow is the way.

Alternative Drying Methods

If you do not have a dehydrator:

Fan drying: Place mushrooms on a wire rack in front of a fan in a dry room. This works but takes 24–48 hours and may not achieve cracker-dry in humid climates. Often used as a pre-dry before finishing in a dehydrator.
Oven drying: Set your oven to its lowest temperature (usually 50–70°C) with the door slightly ajar for airflow. Place mushrooms on a wire rack over a baking sheet. Check every hour. This works but requires monitoring to avoid overheating.
Desiccant drying: Place fan-dried mushrooms in an airtight container with a thick layer of desiccant (silica gel or damprid). This is best used as a finishing step after initial air drying, not as the primary drying method.

Tip: A basic food dehydrator costs around $30–50 and is the single most valuable piece of equipment for mushroom growing after the controller itself. It is well worth the investment.

Storage

Properly dried and stored mushrooms can maintain quality for 1–2 years or longer.

Storage Requirements

Airtight container: Mason jars, vacuum-sealed bags, or food-grade containers with good seals. The goal is to keep moisture out.
Desiccant packs: Place 1–2 food-grade silica gel desiccant packs in each container. These absorb any residual moisture and keep the mushrooms cracker-dry. Replace desiccant packs every few months if stored long-term.
Cool, dark location: Store containers in a pantry, cupboard, or drawer away from light and heat. Room temperature is fine.
Label everything: Mark each container with the strain name, harvest date, and flush number.

Storage Method	Expected Shelf Life
Airtight jar with desiccant, room temp	12–24 months
Vacuum sealed with desiccant, room temp	2–3 years
Vacuum sealed with desiccant, freezer	3+ years
Open container, no desiccant	1–3 months (will reabsorb moisture)

Danger: Never store mushrooms that are not fully cracker-dry in a sealed container. Residual moisture in a sealed environment creates conditions for mould growth and bacterial contamination, which can make the mushrooms dangerous. If in doubt, dry them longer.

Yield Expectations

Yields vary by strain, genetics, conditions, and technique. Here are rough expectations for a standard 54–66 qt monotub with CVG substrate:

Metric	Typical Range
First flush (wet weight)	200–500 g
First flush (dry weight)	20–50 g
Total all flushes (wet)	500–1200 g
Total all flushes (dry)	50–120 g
Wet to dry ratio	Approximately 10:1

Tip: After harvesting, switch your controller to Rest mode to prepare for the next flush. See the Multi-Flush guide for details on getting multiple harvests from the same substrate.