Grow Guide for PF-Tek MycDrop™ Grow Kit


03/10/23: We now have the option of ‘No Gloves’ as well as offering an Enhanced kit version which includes 500mL of Vermiculite


Step 1: Inoculation of Brown Rice Flour Based Substrate

Work in a small, clean and draught-free room. We always recommend working within a Still-Air Box when completing inoculations of any product.

Make sure you’re showered with fresh clothes. Clean your hands and forearms with the blue Clinell wipes, then fit your gloves and face mask securely.

Prepare your chosen gourmet mushroom spore/culture syringe for use by screwing in a new sterile needle.

Remove your Mini MycoBox from the bag. It’s now exposed to the open air and potential contaminants – this is where working within a SAB will greatly reduce your chance of contamination.

Clean all of the grey rubber injection ports on the Mini MycoBox lid with a green Clinell wipe. Don’t touch or try to remove the white air filter strips – this is essential.

Distribute 3ml of your gourmet spore or culture solution between all the injection ports – Take care and do not add any more than 3ml in total to your Mini MycoBox.

If you have any solution left and want to store it – flame sterilise the needle until red hot, leave it a few seconds to cool before putting the cover back on and then keep the syringe with needle attached in a cool, dark place – a drawer is ideal. Before using it again, flame sterilise it another time for good luck.

Step 2: Colonisation of BRF-Based Substrate

Mycelium is living and needs to breathe, so don’t ever store your Mini MycoBox in an airtight container. The cardboard box it arrived in is an ideal place to now store your colonising Mini MycoBox to keep it clean.

Temperature is so important for achieving good colonisation results. Being too hot (above 26°C) or too cold (below 20°C) may result in contamination or slow to no colonisation growth.

Stay between 20-26°C and try to maintain a consistent temperature, ie. don’t let the temperature go up and down too much.

Avoid heat mats please! The warmth is not spread equally which may create excessive condensation, leading to water build-up and an easy pathway for contamination to enter your Mini MycoBox. Consider building or buying an incubator if you’re struggling to maintain these temperatures – it’s way cheaper than keeping your home heating on all the time and gives much better results too.

At 26°C, in optimum conditions, it will generally take around 2/3 weeks for the substrate to reach full colonisation or 4/5 weeks at room temperature but this does depend on other factors like genetics, etc. and nature being unpredictable!

Step 4: Perlite for Humidity and Hydration

Pour your perlite into a strainer and rinse under a tap until it’s soaking wet. When it stops dripping, pour it all into the provided XL Grow Tent. Please cover your mouth and nose when working with perlite – it’s dusty and nasty to work with (take it from us).

Step 5: Dunking

Many repeat this process after each flush of mushrooms, but you can do it to begin with if you like.

Fill a container with water deep enough to submerge your colonised substrate (known as a ‘cake’) in. Open your Mini MycoBox and remove the colonised cake – it will be a solid block.

Place this in the water and you can use something like a plate to weigh the cake down to stop it floating, as you need it to be fully covered in water at all times. Put a lid on the container or cover it to keep everything clean.

Leave your cake submerged like this for anything between 6-24 hours.. depending on how much patience you have! But obviously, the longer you leave it, the better the results can be.

Step 5: Place Cake into XL Grow Tent

After your cake is finished dunking, take it out of the water and give it a rinse under a tap. Allow excess water to drain off and then carefully place the cake back inside the Mini MycoBox with the vermiculite layer on top (like the way it was before you took it out).

Now place the Mini MycoBox onto the damp perlite and fold the top of your grow tent over to keep the humidity in and dusty nasties out. A little tape might come in handy if it’s not staying closed.

Step 6: The best bit… Fruiting your mushrooms!

You can also gently mist some water over your cake every few days but take care to avoid introducing too much water or your substrate will ruin. If you notice any excess water, dab it up with tissue paper. Don’t start misting your cake until at least 24 hours have passed since you dunked it, as there will be loads of water in your substrate at this point and you will definitely waterlog it if you mist.

Maintain a temperature just below your incubation temp for this fruiting stage, somewhere between 20-22°C tends to be great for many popular species. When the temperature is right, essential levels of humidity will naturally build up inside the grow tent from the water you just allowed to soak into the substrate.

The only time you should remove from your tent is when you’re ready to harvest your mushrooms – removing it even for a few seconds before this is enough to lose humidity and cause growth defects (aborted pins, caps breaking, etc).

Humidity and FAE (fresh air exchange) are extremely important for pinning and healthy mushroom development, as is temperature and light. They will all need to work in harmony.

We suggest cutting a 1cm slit through both sides of the tent, near to the top and placing an electric fan somewhere in the room on low setting. This will create a gentle air current inside the room which will increase FAE inside the grow tent. Your mushrooms will also need light to grow – we recommend indirect sunlight or a 6-7000K LED or fluorescent light a couple of feet away. Some growers swear by a 12/12 cycle (12 hours of light, 12 hours of darkness) but this is just give or take.

If you notice the inside of your grow tent looking dry, there are a few things which can cause this: The environment is too cold so humidity is not developing inside your grow tent, the fan is too close, the slits you cut in the tent are too big (cover excess with tape), grow lights are too close and drying out the substrate… Observe what’s happening and adjust your setup as required – fantastic results depend on it.

After around 3-7 days you’ll begin to see lots of tiny white dots – these are hyphal knots which will develop into primordia, aka mushroom pins… the exciting part! It’ll then only take 4-5 days for them to grow into fully mature mushrooms ready for harvest.

During this time, they’ll let you know if something isn’t quite right – fuzzy mycelium at the base of the mushrooms and/or thin stems are an indication that more FAE is needed so increasing the fan speed or length of the cuts on the bag might be something to try.

Don’t worry about any mushrooms growing around the sides and bottom of the cake, you’ll still be able to harvest them. If you want to give your mushrooms more room to grow next time, consider using a fruiting chamber.

When the veil beneath one of your mushroom caps is about to tear off, this is when you should harvest your first flush. If you don’t get there quick enough, spores will begin to drop from your mushroom caps and make a mess! It’s best to cut the mushrooms off with a clean scalpel or knife, you can also just pull them off but be careful not to damage the substrate too much.

After you’ve harvested all the mushrooms from your first flush, you should dunk your cake again to rehydrate it for round 2! Remember to rinse it and allow excess water to drain off before placing back into your grow tent. It’s really important that you dunk your cake between each flush for best results. Keep your perlite damp too, it tends to dry out quickly – do this during dunking the cake.

If you’ve taken good care of your grow kit, you should achieve multiple flushes of beautiful mushrooms before the nutrients are all used up.


Thanks so much for ordering our grow kit. We hope you love using it and reap the rewards.

We also recommend reading our general troubleshooting guide as it’s full of useful information which will help you solve and avoid problems.