Moving on to new project

Hi there!

Thanks for visiting. Just a quick note to let you know that this site is no longer maintained and comments have been deactivated.

I’m in the process of launching a new growing website focusing solely on organic techniques. There is also a book in the pipeline on the same topic.

I’ll link up to the new site once it is populated with content. Or you can follow me on twitter for updates @billgri

I’d like to say a huge thank you for dropping by and I hope to see you in my new project (which will also have easy techniques for windowsill growers).


Bill Griffin (aka Percy Grower)


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I’ve been writing for Marijuana Times

For anyone checking back to this site for new content I’m sorry that there has not been much action lately. I’ve been busy writing content for a few cannabis related sites elsewhere on the web.

I’m in the process of redesigning the site to better reflect this work.

You can find my latest writing on

Thanks for the great comments and continued support!

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Ask Percy: how to avoid cannabis plant stretching on a windowsill

Billy asks, “I tried growing some autos on my windowsill, I had some success in that they grew but I chopped them too early being too eager so the buds had very very little to no effect at all (as in a high). But I remember they stretched so much reaching for the light is there any way around this? Thanks”

Hi Billy

Glad to hear that you did a grow and thanks for sharing your results.

I hope you’re not put off with the end smoke. Each grow is an experience to help you make the next one better. It’s a learning process.

A plant will stretch to get more light. It needs light to grow, just as much as it needs food, so the stem stretches to get the leaves into the sun.

Only way to stop the stretch is to make sure the plant has the maximum sunlight possible. Needs to be a south facing window. Or put it in an east facing window in the morning and move to the west in the afternoon – you’re aiming for 15-16 hours of sun per day (so basically as much as you can).

Use the seasons to your advantage. Start to grow late spring/early summer and allow to grow over the summer when there is more natural sunlight.

Indica dominant strains tend to get less stretch than sativas so look out for indica dominant autoflowering seeds. I’ve had great results with Dutch Passion seeds.

Don’t forget to be patient before harvesting. The white pistols should all be wilted and brown. Trichomes on the buds should be turning milky (from clear) and some should be starting to turn red/brown. The longer you leave it the more body stone you will experience (great for insomniacs) or harvest a little earlier for a more cerebral high. If you can’t see with the naked eye invest in  a magnifying loupe 30-60x, ones with built in LEDs are handy.

Happy growing


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Organic sun grown autoflowering cannabis checklist

For those of us who grow our organic cannabis using natural sunlight you may be thinking that there is not a lot to do in the middle of winter. Au contraire I cry. If you want things to go smoothly during your summer grow then now’s the time to be planning.

I grow autoflowering cannabis because it suits me. In my book I talk through the argument as to why I choose this variety. You may also be interested to read the windowsill weed manifesto that explains the philosophy behind my grows.

As a casual grower there are some basics that you should have in order to get the most out of the summer growing season which I’ll run through below. In case you are interested in trying the same grow there’s a checklist at the bottom of the article.


I’ve got a great selection of seeds and I hope you have yours already too. If not, nows the time to grab what’s left in the seed banks. Herbies have a fantastic selection of autoflowering cannabis seeds and are discrete and trustworthy.

This season I’ll germinate more than I need and choose the strongest looking plants for the grow. I may just pop then in some mini plastic propagators I have. They are not heated but usually around beginning of May, when I intend to start, it’ll be warm enough in the greenhouse without using a heated incubator.


Unless you choose to go direct in the ground then you’ll need something to put your plant in. Up to now I’ve been growing in 10-12 litre round plastic pots. This year I’m going to give some fabric pots a try. They are a bit bigger than I normally grow in. I have a 19 litre and a 26 litre.

To get the most out of the sun I’m forced to move my pots around the garden. I’m hoping that this will be possible with these pots. The bigger the pot the more space the roots have to grow. In some miraculous balancing act by mother nature what’s up top more or less equals what’s down below. So more roots will result in greater yields. That said, under the Belgium sun my autoflowering cannabis plants will have a limited size so I’m interested to see the difference the 2 pots sizes make. Maybe 19 litres will be enough for them to max out.

Growing medium

Up until now and as described in my book I’ve been growing in a home made organic growing medium made up of one third home made compost, one third, perlite and one third coco. This year I’m gonna buy some ready mixed organic growing medium from a company called Plagron called “Batmix”. This is already loaded with natural nutrients which will see the plants through to flowering, at which point I can monitor and see if they need any additional nutrients.


I have a bottle of BioBizz Bloom kicking around so will use that in case the leaves are starting to turn yellow around flowering time. Any other issues I’ll have to pick up when the time comes.


This year I’m going to be a little more consistent in my application of neem oil and blast the young plants with it biweekly. This will strengthen their immune system and help them fight off bugs and moulds when they are big. It will also stop those pesky caterpillars and leaf miners that like to strike the plant during the vegetative period whilst the fibrous stems are not too woody. These attacks can weaken the plant and raise the risk of moulds affecting the blooming cannabis flowers. I won’t be using any other pesticides throughout the grow.


On cooler days I tend to keep the plants in a small lean to greenhouse. Whilst they are in there I have an oscillating fan to keep the air moving around the plants.

Measuring the environment

Water (pH measurement and adjustment)

I use rain water that I adjust the pH to 6.5. I’ll have a bottle of pH down on hand and make sure that my pH metre is up and running so it’s not a panic to order a new one as the growing season starts.

Temperature and humidity

I have a bunch of hygrometers that will measure the temperature and humidity in the greenhouse. This way I can open the windows if the temperature gets over 27 degrees C. I had ran a powerful extractor fan in the past but given the amount of holes in my greenhouse was probably overkill. It was also a bit noisy and made the small grow I had appear a lot more planned than I wanted it to. It lost the innocence of just popping a seed in a pot and seeing what happened. Maybe the yield will suffer slightly because of it. When it’s too hot the plants will be outside in any case.

Throughout the year I’ll go into more detail on each of the steps I’ll be taking. Hopefully to inspire others to grow their own medicine and also I’m hoping to learn more from you guys too along the way. I’m always open to tips to improve the grow.

As promised here’s the checklist. In parenthesis I give some specific brands I’ll be using but use whatever alternative that this available to you. I don’t swear allegiance to any of these.

Organic sun grown autoflowering cannabis checklist

  • Autoflowering cannabis seeds (see the seed buying guide)
  • Fabric pots (SmartPots)
  • Organic mix (Plagron Batmix)
  • Organic flowering nutrient (BioBizz Bloom)
  • Neem oil
  • Oscillating fan
  • pH meter
  • pH up/down
  • Hygrometers

If you are interested in finding out my cannabis growing journey then I invite you to check out my book Windowsill Weed: a home growers cannabis journey. It has loads of info to convince you that growing naturally at home is the best way to go for your personal cannabis supply.

Are you planning a small grow this summer? I’d love to hear how you’ll be growing yours. Please share in the comments below.

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The Windowsill Weed Manifesto

When I started to grow I was confined to the windowsill of a city apartment. Since then I’ve graduated and now have my cannabis garden in a modest greenhouse. I put the plants out in the sun in the yard or vegetable patch when the weather’s right.

The title windowsill weed should not be taken literally. It’s a reference to how I learned to grow and also proof of how easy it is to grow cannabis.

My mission is to get the best out of growing cannabis within the following constraints which I’m going to give the grandiose title of “The Windowsill Weed Manifesto”.

The grow must be :

#1 100% Organic

This means the medium that the plant grows in, any additional nutrients added and pest control.

#2 Use natural light (from the sun)

Can grow in a window, balcony, terrace, yard or greenhouse.

#3 Autoflowering

I’m gonna focus on growing autoflowering cannabis. This is because I think it has advantages to the casual grower over regular cannabis plants. Most notably their quick finishing time and compact size. I find what I grow is strong enough to get me to where I want to be. The higher CBD percentage is also a positive point for me.

#4 Grown within legal limits

In Belgium it is decriminalised for an adult to grow one mature female cannabis plant. Given how open I am about my activities it’s wise that I stick to this limit. Depending on where you live your limit may be higher. Ideally, this limit would be raised to at least 5 plants.

Within this site I explore how to get the best results I can within the four constraints of this manifesto.

If you are interested in finding out my cannabis growing journey then I invite you to check out my book Windowsill Weed: a home growers cannabis journey. It has loads of info to convince you that growing naturally at home is the best way to go for your personal cannabis supply.

Is there anyone out there who’s growing under these restraints? I’d love to hear about your experiences. If so, please share with us all in the comments.

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