Back in the winter I announced my plans to graft my own tomatoes. I undertook the project more in a spirit of idle curiosity than necessity. We haven’t had the sort of soil problems that might require grafted tomatoes but I thought it would be fun to try.
To graft tomatoes you grow a hardy root stock (I chose Maxifort) and the tomatoes you want to graft them on to. You then make the graft and secure it with a grafting clip. For the grafting process I used the directions in the following video from Cornell University:
The next step is to put the grafted seedlings into a “healing chamber” consisting of a dark, warm and humid environment that gives the plant a chance to heal and the graft to take. You then slowly introduce light over a period of days to transition the grafted plant to normal growing conditions.
What could possibly go wrong?
Let’s just say that at Root Simple Labs mistakes were made.
- The root stock grew a lot faster than the heirloom tomatoes I chose. When you graft you want similarly sized stems. It would have been good to stagger the days I started my seeds rather than planting them all at one time.
- The healing chamber needs to be a carefully controlled environment. I improvised a greenhouse by putting my seedlings in plastic bags. This worked but I had trouble re-introducing light in a uniform way. Grow lights would make this easier. And it was a pain to open all the individual bags to mist the plants.
- Because of my lack of stem sizes to choose from I ended up with graft unions too close to the soil level. Of the six plants that survived my horticultural incompetence, I think they all may just be growing from the graft union itself rather than the root stock. I’m hoping that I can tell when I pull the plants at the end of the season.
- I used potting soil rather than a seed starting mix. That’s just plain stupid. What was I thinking?
- Next time I’ll get a selection of grafting clips in different sizes. That would give some flexibility in when to graft the plants.
Despite my cascade of errors I still have tomato plants (though probably not grafted ones) and I learned some valuable lessons should I attempt this project again next year. I’m thinking that instead of tomatoes, which have done fine in our garden in the past, I might try grafting peppers or eggplants which we have had trouble growing.
How are your tomatoes doing this summer? Are any of you growing grafted varieties?