Update: Ultra-Small Batch Halcyon Release

March 22, 2014 by admin

The Halcyon seed is sold out! Thanks to the wonderful people that stepped up and bought this seed. Your support has helped move the CGRI forward. You rock! -Ben

Ultra-Small Batch Release ~ The Halcyon

December 28, 2013 by admin

halcyon_projectThe Halcyon is an F1 hybrid based on an Afghan Kush female and a Colombian male. I first made this seed in late 2012. It was trialed in 2013 and is now being released.

The cross produces a vigorous, uniform F1 generation that is highly resinous and beautifully fragrant. The flowers are very potent and produce a strong effect with an unusually clear head.

The fragrance is a blend of both lines, the sweet, syrupy ‘candy’ notes of the Kush combining with the more tart and piney fragrance of the Colombian. Based on fragrance alone the cross is unique and enjoyable. Add to that the wonderfully potent character and you’ve got a winner.

As I wrote earlier I will package exactly 100 tins of this seed, 14 seeds per tin, and offer them for sale. 100% of the proceeds will go to support the Cannabis Genomic Research Initiative to support our research goals.

The work being undertaken is groundbreaking in our industry. The knowledge and the know-how that will result from this project will spawn a wave of innovation in the Cannabis industry unlike anything we’ve ever witnessed.

If you’ve taken the time to read this far and you believe in advancing the public understanding of this crop please take a second and share this article or recommend it to a friend.

Remember, 100% of the proceeds of the Halcyon will go to support the CGRI. Can I count on your support? I hope so.


Ben Holmes


Centennial Seeds


Colorado Researchers Seek to Map the Cannabis Genome

December 23, 2013 by admin

A research team at the University of Colorado at Boulder has begun a landmark project to build an ultra-high density genetic map of the Cannabis genus, placing tens of thousands of genes onto chromosomal positions and will use these resources to identify important genomic regions underlying variation in traits such as the production of secondary compounds, biomass accumulation, fiber quality and quantity, and other economically valuable traits.

This project will positively impact society through improvements in Cannabis varieties useful for medicine, bioenergy production and textiles. This investigation is pioneering in asking genomic questions dealing with domestication, coevolution, genotypic and phenotypic traits and inheritance in the genus Cannabis.

The project is known as The Cannabis Genomic Research Initiative or ‘CGRI’ and the work is being conducted at The Kane Lab at CU. Dr. Nolan Kane and his team have extensive experience in addressing these and related questions with genomic and bioinformatic approaches, with over 50 scientific publications.

This research will answer fundamental questions about the crop and its characteristics and will put Colorado’s university research of Cannabis ahead of the entire world.

I’ve been asked to play a role in this project by providing heirloom seed stock as well as cultivation and analytical work to support the project. I have also taken it upon myself to assist in fund raising efforts to help pay for this groundbreaking work.

To help accomplish this goal I will be making available for sale a very limited quantity of a hybrid seed I call The Halcyon. The seed will be limited to 100 packs priced at $100 each. Centennial Seeds will donate 100% of the proceeds from this seed batch to the CGRI.

I’ve met a lot of wonderful people since I’ve been in the seed business and I have no doubt that there are 100 of you that will step up to support this project. The Halcyon seed will be packaged and ready by January 1st. Please consider making a $100 donation to this courageous effort.

Thank you for your support.

Ben Holmes, Founder

Centennial Seeds

Origins of a CBD Collaboration

December 20, 2013 by admin

Earlier this year I contributed a cut of Harlequin (de la Althouse) to a seed project run by my friend Lutzy.

Harlequin is a clone-only CBD line from somewhere in the West. Clone-only means that it is a living clone derived from an individual plant. Another way to say this is that no seed version of Harlequin has ever to my knowledge been made available. It is notoriously low-yielding and based on the analytics I could find online there seem to be several chemotypes out there.

Bill Althouse is a local man who gave away some incredibly large number of Harlequin clones to the community in an attempt to get CBD into the hands of anyone who wanted it. Althouse has a big heart and has earned my respect.

My friend Lutzy put together a selfing project of a very resinous, very high CBD plant, the goal being to stabilize that special plant in seed form. I saw this as an opportunity to outcross the plant and I just happened to have Bill’s Harlequin sitting around sponging off my fertilizer and electricity.

I have a good recipe for silver thiosulphate solution and the chemicals needed to do this so we made a batch of STS for the reversal phase. We divided the seeds up, and now we each have some interesting new raw material to add to our development programs.

I’ve yet to grow these seeds out but I am very interested in the outcomes. In particular I’m interested to see what each plant contributes to the cross. It’s important also, I think, to stabilize the Harlequin traits in seed form, if not directly by selfing it, then at least outcrossed in this fashion to a similar but unrelated line.

I’m working hard to drastically upgrade my analytical capabilities. Once I have those tools in place I will be able to quickly identify the highly desirable types.

I cannot stress enough the importance of these types of collaborations to the quality and diversity of the seed supply in Colorado.



Thin Layer Chromotagraphy Lab

December 10, 2013 by admin

Equipment is beginning to arrive for my new thin layer chromotography lab. Waiting on solvents, micro pipettes and a text book.

TLC_Tank_resizedBy January I will have in-house cannabinoid screening capability.

This will rapidly accelerate the seed development process by allowing me to screen for desirable chemotypes.

Thanksgiving Holiday Hours

November 24, 2013 by admin

We’ll be open Monday and Tuesday, November 25th and 26th from 9AM-4PM.

Harvest Crop Shares 2013

November 14, 2013 by admin

I love this time of year for a lot of reasons but one thing that makes it special are the crop shares I receive from a few friends that grow my seeds.

In these arrangements i usually provide something to grow in the form of seeds or starts, the friends provide the space and the love and what comes back is just wonderful.

I won’t lie, I do have some control over what is grown each year. This allows me to sample new varieties and some old standards as well.

annapurnaThis is the second year I’ve received samples of my Nepalese Watermelon Haze hybrid.

This year the plants were allowed a few extra weeks to flower and the results are just terrific.

The dried and cured buds are dense and beautifully trimmed. The fragrance is sweet and spicy. Pure Sativa.

The effects are very uptempo and motivating, not what I would want before sleep.

This seed is available in very limited quantities which means it’s time to make more.

My thanks to the people that grow the herb I consume. I enjoy the results and your friendship.

Centennial Seeds to Lease Boulder County Farm for Hemp Seed Production

November 10, 2013 by admin

This morning I shook hands on a farm lease for the 2014 season.


The farm is located in Boulder County.

There are irrigation ditches and a well for water. The farm has been fallow for more than a decade and has been used to graze horses. Based on the amount of scattered manure I will guess that the soil is highly fertile.

I plan to plant Carmagnola hemp to increase the seed I’ve been working with. This will be a very small scale planting in 2014. My goal is 200 – 300 lbs of viable seed.

This is a life-long dream for me, farming.

Open Saturdays 9AM – 1PM

November 8, 2013 by admin

If you find it hard to visit us during the week you will be happy to know that we are open on Saturdays from 9AM – 1PM.

Update: Nepalese Highland Sativa Heirloom

November 7, 2013 by admin

I planted the Nepalese highland sativa back in August. That was 95 days ago and the plants, as i suspected, are enormous.

In the past I’ve grown seed from a nearby region in Nepal and the plants topped 15 feet indoors and spread 8 feet across the lower branches. I wanted to prepare for this possibility so I topped the plants aggressively and set them under a sheet of trellis fabric.

On October 11th I shortened the day length to 12 hours, down from 18. The plants are growing in 10 gallon Accelerator aerator pots in Fafard Organic Mix FOF-30 amended with dolomite lime. I’m feeding Jack’s 13-2-13 @ 140 PPM nitrogen and mono potassium phosphate @ 80 PPM phosphorus.

Here is an example at just over three weeks of flower.


The plant’s branches have been woven through the trellis fabric in such a way that every growth tip has access to direct light. Over several weeks the weaving process continues until the canopy is relatively flat.

Once flowering is induced, the growth tips will begin to stretch toward the light. Deal with any stray branches that break out of the surface.

As you can see the lower branches and trunk are completely bare. The canopy above is so dense that very little light gets through. Any flowering sites below the canopy are removed. This redirects the plant’s energy resources to the canopy where they will be put to more efficient use.

At this point the plant extends 7 1/2 feet by 5 1/2 feet. That’s more than 40 square feet of surface area which is lit by two 1000W bulbs.

Since this is the first time I’ve grown this landrace I have no real way of knowing how long it will take for them to finish flowering. I’m going to guess and say it will be in the 12 – 15 week range.

The trick will be keeping them healthy and flowering until that day comes.