Growing Tomatillos and Ground Cherries on the Cheap

Growing tomatillos and ground cherries looked simple enough until I planted one tomatillo last year. One. Watched it grow all summer, flower like crazy, and produce exactly zero fruit. Stood there in September staring at a six-foot plant loaded with empty husks feeling deeply betrayed. Turns out I’d skipped the most important part of the instructions.

Tomatillos need a friend. At least two plants for cross-pollination, or you get a very healthy, very unproductive garden ornament. Ground cherries are a little more forgiving since they’ll self-pollinate, but they still do better with company. Plant at least two of each. Consider yourself warned, unlike me.

Getting Transplants in the Ground

June is about right for putting these out in the Pacific Northwest where cool summers are the norm. Both tomatillos and ground cherries are in the same family as tomatoes, so they want similar treatment: wait until nighttime temps are reliably above 50, harden them off for a week if you started them indoors, and don’t rush it. A stunted transplant in warm soil will pass a stressed transplant in cold soil every time.

Spacing matters more than people think. Tomatillos get big. Like, embarrassingly big if you’ve been treating them like a pepper plant. Give each one at least 3 feet, ideally closer to 4. Ground cherries are a bit more compact but still want 2 to 3 feet of breathing room. I crammed mine in one year and spent all of July untangling a jungle. Dumb. Do not recommend.

Cheap Supports That Actually Work

Here’s the thing about tomatillos: they sprawl. Enthusiastically. Mine flop over, root where they touch the ground, and basically do whatever they want. You can fight this or you can work with it, and as someone who is constitutionally opposed to spending money I didn’t have to spend, I work with it.

Old tomato cages are perfect for ground cherries. The small cone-shaped ones that are useless for actual tomatoes? Ideal here. Tomatillos want something sturdier. I take prunings from my fruit trees and shrubs (the ones I cut back in late winter anyway) and push them into the ground in a loose teepee shape around the plant. It’s basically a brush pile with ambitions. Costs nothing. Works fine. The plants lean on the branches and stay off the ground enough to get some air circulation going.

If you’ve got a pile of random stakes in the garage, those work too. Run some twine between them in a loose grid. This is not a Pinterest garden. This is a functional garden, and there’s a difference.

When Are They Actually Ripe

The husk tells you everything. For tomatillos, you’re waiting for the husk to fill out completely and start to split or pull back a little at the base. The fruit inside should be firm and green (or purple, if you planted a purple variety). Don’t wait for them to turn yellow unless you like them sweeter and softer. Ground cherries are ripe when they drop off the plant on their own, still in the husk. That’s it. They’ll just fall. You pick them up off the ground like you’re foraging in your own yard, which, honestly, is my favorite kind of harvesting.

I let a few ground cherries go every year without even trying. They’re sweetly tropical-tasting and a little weird and my kids think they’re a snack from a video game because of the little paper lantern husk. Hard to argue with that.

Saving Seeds Without Trying

Both of these plants will basically save your seeds for you if you let them. Leave a few fruits on the ground at the end of the season and there’s a decent chance you’ll have volunteers the following spring. Ground cherries especially. I pulled about thirty volunteer ground cherry seedlings last spring from where I’d grown them two years before. Transplanted the best ones, composted the rest. Free plants, zero effort.

If you want to be more intentional about it, let a few fully ripe tomatillos or ground cherries get soft and overripe, scoop out the seeds, rinse them, and dry them on a paper towel for a week. Store in an envelope in a cool dry spot. Germination rates stay good for three to four years. The frugal math on that is genuinely satisfying. (Growth mindset. Gardening pun. Sorry.)

One thing worth noting: if you’re saving tomatillo seeds, remember those two plants you planted for pollination? The seeds may be crossed between them. That’s usually fine unless you’re growing two very different varieties and care about keeping them pure. Most home gardeners don’t need to worry about it.

A Few Last Things

If you’re already growing tomatoes, you’ve got the knowledge to grow these. Same basic needs, similar pest watch (check under leaves occasionally), and they’re honestly a little more low-maintenance once they’re established.

Water consistently when they’re getting established, then back off once they’re growing strong. If you’ve already built a cheap DIY drip system for the rest of your garden, toss a line their way and call it done.

Long story short: growing tomatillos and ground cherries comes down to a few basics. Plant two tomatillos, let the ground cherries sprawl a little, watch the husks, and let the plants drop their own seeds in fall. They’ll basically take care of the seed-saving part themselves. Which means more time for me to stand in the garden eating ground cherries directly off the ground like some kind of feral gardener. Living the dream.

Photo by Valeria Nikitina on Unsplash