New Watermelon Breeding Project 2018 and Beyond…


Today i’m sharing about a new plant breeding project i am planning on working on. The Watermelon Landrace project I’ve been developing for Northern Colorado has started to progress quite well and i am very pleased in the direction it is heading. This past summer of 2017 i harvested many that were of decent size, grew in my soil, and tasted excellent. I started to eliminate the ones that still develop blossom end rot and other poor traits such as funky shape or poor flavor. Starting to only save the best seeds.


I originally added some Colorado Red-seeded Citron melons to my watermelon landrace because i wanted to breed watermelons with red seeds and frost tolerance. Citron Melons are supposed to be pretty damn hardy and supposedly have this desired frost tolerance. The problem? Citron melons aren’t exactly edible. They are not poisonous, just super hard white flesh and bland bland bland. Actually they are a very old heirloom type of watermelon called the Colorado Preserving Melon or the Colorado Red-seeded Citron. Apparently they have lots of natural pectin in them which is useful for making jams and jellies for toast. And did i mention they can breed quite easily with modern watermelons?


When it comes to the Colorado Red-seeded citron i absolutely love their red seeds. I really want that trait in my watermelon landrace. I guess there are a few red seeded watermelon varieties out there already, but they are few and far between.

So, what happens when you breed a modern red or yellow fleshed watermelon with a citron melon? Well, i don’t exactly know. Yet. This year i planted a few of the red seeds i harvested from the citrons from last year that were mixed in with the landrace. The seeds i got were all still red so i figured they probably self pollinated. Regardless i added them to the landrace watermelon seed i planted this year in hopes that they would grow (not die), cross, and produce viable seed.


I’m happy to report that so far that part of the project was a success. The top photo above shows what i think are confirmed F1 Citron x Watermelon hybrids. I suppose they could be F2, but i’m just going to assume F1. The seed was harvested from fruits that showed the characteristic “white cloverleaf striped mottling” that Citron Melons have, and from fruits that had hard white bland flesh when all the other watermelons had ripe yellow or red flesh. How do i know these seeds are hybrids? Well because the seeds were not red this time! In fact they were all different kinds of patterns and colors. Some red-black, some pure black, some greyish, some grey-black-mottled, etc.

Looking forward to growing this line of seeds out and reselecting for the traits i want. Red seeds would be awesome, but not necessary. Frost tolerance would be even more awesome, but not necessary. Even without those traits what impresses me most about Colorado Citron Melons is the fact that they grow so darn well in my climate, with my poor soil, and still grow full size melons even when over crowded with other watermelons that don’t do well, and even thrive with relatively low amounts of water. These traits alone are so very desirable to be folded into my watermelon landrace that this project is so exciting even now when i’m just beginning.


I’ve heard a rumor that way back the Soviet Union (USSR) did lots of plant breeding experiments (maybe because of the breeding genius known as Ivan Vladimirovich Michurin), and part of these experiments involved Wide Hybridization or Distant Hybridization, which means crazy breeding like interspecific, intergeneric, intrageneric, and intraspecific breeding and attempted crosses that most people would never try or attempt. Some of these crosses were successful. What i’m interested in is the Soviets work on Citron-Watermelon hybrids. Apparently they experimented with these long before i have and rumor has it that they were able to recover some nice tasting watermelons that were able to be stored for several months into the winter. Awesome. I will update this blog post when i have more information about this. There are already supposed “Winter Watermelons” that supposedly keep for several months, but i’m sure those can be improved, or i can just breed my own winter watermelon variety. Exciting stuff!

Edit Nov-15-2017:

Okay, so i finally received a copy of the rare book titled “Wide hybridization of plants (Otdalennaya gibridizatsiya rastenii) Proceedings of the Conference on Wide Hybridization of Plants and Animals; collection of reports” from inter-library loan. A mouthful, i know. Thanks to WorldCat to helping me track it down. Not many copies of it left around.

Originally written and published in Russian in the U.S.S.R. in 1958, and Translated into English in Jerusalem Israel in 1962. The Soviet Union was known in those times for great scientific advances including launching the space race, the first cosmonaut in space, Sputnik, and other crazy medical advances like the Skenar and Bacteriophage medicine, to strange sci-fi spy weapons in the Cold War. Apparently they also were advancing in novel plant breeding techniques and programs. Michurin was one of these guy’s. If you’ve never heard of him or his plant breeding techniques and success go look him up. I honestly don’t know much about him myself, but i do know he was an accomplished plant breeder, most notably with wide genetic crosses that noone else thought would work.

Anyway, back to the Interspecific Hybridization of Watermelon work done by the Russians with Citron x Watermelon crosses in 1958. Turns out they did have success with it. The F1 generation was mostly like the wild Citron with bland hard tasteless flesh. F1 and F2 Hybrids with Citrullus colocynthoides are similar to their wild Citron parent genetics. Late-ripening, coarse compact unsweet fruit pulp and a thick rind. Quite unremarkable. But that’s what i was already expecting. One cool note though is that some of these in future segregating generations or backcrosses to domestic watermelons can produce some sweet watermelons that have some storage ability. Meaning they ship well and can store for many months. In fact some of them get sweeter over time whereas domestic watermelons do not. So all in all some cool potential in the project after all! I’m even more excited now!

If you want to read the Soviet’s 1958 watermelon research yourself, i have taken the effort to scan some of the book into a PDF for you. It’s not the whole book, but it has the relevant chapter on Watermelon and Citron crosses.

Here’s the PDF: Wide_hybridization_in_plants_TSITSIN


Growing Watermelon Landrace in Colorado 2017 Success!!!


Most of the watermelons are done for the year and eaten already. Many of them were good tasty Canary Yellows. One Salmon-yellow and one Pink were so/so. I’m trying to not save seeds from now on from any that taste bland like the salmon-yellows. Or others that grow poorly. I think i will also start selecting against those that have bacterial rot at the flower end and those that split open. But i’m happy in the direction these are headed. I have a side breeding project where i am letting some Colorado red-seeded citron being pollinated by the landrace watermelon. I’m hoping that in the future that leads to a more cold-tolerant yellow fleshed red-seeded watermelon strain. Some seeds from those are all crazy colors this year with some partially red-black and others with unique gray spots. Just a side project for now.

Generally the small bowl-sized watermelons are from my garden. I had the opportunity to have a small local organic farmer grow some of the landrace watermelons for me in fertilized soil and on black plastic. Those ones grew a little bigger for him. I was able to purchase and collect a few of those back. The long one looked like a yellow-fleshed Lofthouse Charleston Gray strain to me… but i don’t know for sure. I cut it open a little early. Apparently the long ones take longer to ripen so the dry three-tendril method didn’t exactly work on those, but it did for my small round ones!











All in All i’m happy to finally be able to grow decent sized tasty watermelons here in the heart of Northern Colorado. Where few are able to succeed at growing watermelon at all! Success!!!!

Project Updates November 2015

80/20 1020 Extruded aluminum t-slot y-axis 3d printer bracket
80/20 1020 Extruded aluminum t-slot y-axis 3d printer bracket

The first update is that i’m still steadily designing new parts in solidworks for my custom 3D printer. This photo is one of two y-brackets that will hold the 1020 size t-slot extruded aluminum (from 80/20) y-axis beam. It looked good in Solidworks, now it just needs to be fabricated (3d printed) into a real-world working part (as with many other parts).

Y-bracket for custom 3D printer
Y-axis bracket for custom 3D printer

It’s really fun designing parts and then seeing them become real functional parts. Recently I’ve even been looking into a local program for CNC machinist training as a job. Apparently there is a large shortage of qualified CNC machinists in my area along with a booming and returning engineering and manufacturing hub here in the area.

While i was designing new parts and fitting them together i found a few minor problems with a few of my old designs being off and not lining up properly with the 1020 extruded aluminum. So i spent some time fixing that and cleaning them up a bit. Good to find those errors on the computer first than after i make the parts.

I received the prototype PCB’s for the XYZZY Motor Controller 1.0, The downside is I’ve found numerous errors that i missed, so I’ve been trying to fix those. But then to compound those problems the main circuit itself has a problem where the HIP4081A h-bridge chip circuit is only driving a motor (in this case a test load LED) in one direction. At first it was shorting out the other direction, but now i think it just loads the current down and does not activate one side of the hbridge. It’s actually driving me crazy trying to fix it and find the cause of the problem, but it’s still quite a mystery. Perhaps electronics is just not my thing. Perhaps i really should give up on that project after never being able to have good success. But i don’t know.

In plant breeding news: i was able to harvest three corn cobs this year. Two were decent sized purple husked corn cobs, the other was a good multi-colored flint. The third one had lots of kernel color diversity, it even had several speckled kernels, and chin-marked ones, and even some that had both speckles and stripes! I recently found purple sweet potatoes at Whole Foods and i will be trying to sprout one and grow my own slips for next year.

I was also able to grow a few good squash this year, some good progress on the pea breeding, and an excellent year with Joseph’s Watermelon Landrace. Sorry, i didn’t get good photo’s of the watermelons, but i had some excellent red sweet watermelons and some good yellows as well. Especially for Northern Colorado, the watermelons are the plant breeding project i’m most excited about and ironically having the best success. Can’t wait for next year! And all this despite it being an incredible difficult and strange gardening year!

Success with Watermelon Landrace in Colorado

EDIT 1-29-16: This post is probably more accurately referred to as a “proto-landrace” or a pre-landrace. This post was from 2011, but even though it was my first attempt at starting my own watermelon landrace i still feel it was a moderate success. I hope to update you with how my watermelon landrace has progressed in the 2016 season. It is starting to do really well and selection pressures have occurred that i feel it can truly be called a landrace at this point and even perhaps the beginning of a variety if selected even further. Better than any commercial variety of watermelon by far!

I’m pleased to announce that my watermelon proto-landrace experiment seems to have been a moderate success so far, and here in Northern Colorado no less!

Northern Colorado isn’t exactly known for having a climate that is hospitable to growing watermelons. In fact, I’ve tried planting and growing watermelons at least three times before, each time ended in a miserable failure. This year was different though in part by my determination to succeed and the landrace method i recently discovered. A landrace is basically a mix of a bunch of seeds with lots of genetic variability. That variability makes it easier to locate a variety that is already at least partially adapted to my climate. While some (or many) varieties in a landrace die off immediately, some usually survive. And the theory is that by selecting only the best ones year after year, we eventually get something that is really good. Much of my inspiration for this project has come from Joseph Lofthouse who has had success with a cantaloupe landrace in utah, the breeding work being done by Rebsie Fairholm in the U.K., and indirectly Carol Depp who i believe inspired the two people i just mentioned. When used modernly and deliberately some people refer to it as “evolutionary breeding”.

This is where my experiment with this idea comes into play. I’ve always liked eating watermelon, but the common belief here in Colorado is that they are hard to grow (if not impossible). There is at least some merit in that belief. I myself have failed previously on three separate occasions to cultivate Mark Twain’s angelic food. The biggest problem was that i never used the right varieties. In a sense i guess you could say that the landrace method is basically a shotgun approach. When in doubt, shoot everything!

And while this is only the first year i have attempted this project, i feel the results so far have been extremely encouraging. This is the first year i have ever gotten any ripe watermelons, which in itself is a milestone. I got dozens of them. Many of them were tiny though, like baseball tiny. Some of those tiny ones actually ripened though, and a few tasted really good. I also got some that were of decent size too. I tried my best to select varieties that were mainly Northern, Native American, and short season varieties. My hope was that some might already be adapted to the temperature requirements, some adapted to the soil, pests, etc, and they would be able to cross pollinate with each other, so i could eventually select for one that has all the best traits.

Even with this criteria probably a third of them did not ripen properly, and went directly into the compost pile. But, i was able to harvest a few really good ones, and few OK ones as well. Something that was interesting though was that many of the early ones to ripen were yellow-fleshed watermelons. I had included some seeds from a few that were supposed to be yellow, and i had heard myths of yellow watermelons, but i didn’t really think i would actually be able to grow my own. The first yellow i ate was probably the best watermelon i’ve ever tasted. I didn’t know the yellow ones tasted better than the red ones! I’ve found out that there might actually be three different shades of yellow watermelons, and i think i saw all three this year. What’s remarkable though is that one of the yellow types is a dominant trait, while one is a recessive trait.  How crazy is that! I suspect that the yellow ones might be able to ripen better here in my climate than many of the red ones, but maybe it was just a coincidence. only time will tell.

Anyway, yeah. This whole landrace breeding is pretty darn awesome! I hope to continue selecting the best of the best, and maybe eventually i will have my own special variety that grows vigorously here in Northern Colorado. 🙂 If you’d like to see a few more pictures and details about this breeding project, then please visit my website at