I Tried Container Gardening Vegetables on Our Tiny Patio—Here’s What Actually Grew

Ben was the one who suggested we try growing vegetables in containers on the back porch, back when the kitchen garden was still mostly weeds and disappointment. I thought it was a distraction from the actual garden work we needed to do. He thought it was a low-stakes way to get tomatoes faster. For anyone curious about container gardening vegetables for small patios—or in our case, a wraparound porch with too much afternoon shade on one end—I’ll tell you upfront that we both got some things wrong and one of us got more things wrong than the other. It was me.

Start with the containers, not the plants

Every impulse says to start with seeds, with a list of what you want to eat, with the fantasy of what the porch could look like by August. Don’t do that. Start with the containers themselves, because the container is the whole ecosystem and if you get it wrong nothing else matters much.

Size is the part most people underestimate. A five-gallon bucket is not large. It feels large when you’re hauling it across the porch, but for anything that roots deep—tomatoes, peppers, eggplant—you need at least ten to fifteen gallons, and honestly bigger is almost always better. We use a mix of fifteen-gallon fabric grow bags (the ones from Bootstrap Farmer, around $6-8 each), some old five-gallon buckets Ben drilled holes in, and two large terracotta pots I bought at a farm auction for $4 each. The terracotta looks nice. It also dries out faster than anything else we own, which becomes relevant later.

Drainage matters more than anything. Roots sitting in water will rot, and they’ll do it faster than you expect. Every container needs holes, and if you’re using saucers underneath, you need to empty them after rain. I did not do this consistently. Some plants forgave me. One did not survive it at all.

For soil, skip the cheap stuff. We used Espoma Organic Potting Mix cut with a little perlite, about a 3:1 ratio. A two-cubic-foot bag runs around $12-15 depending on where you get it. A fifteen-gallon container holds roughly two cubic feet. Do that math before you get to the register, because it adds up fast and I’ll address that particular spiral at the end of this article.

What happened with the eggplants in July

I planted two Ichiban eggplant seedlings in five-gallon buckets in late May. They were healthy seedlings from a local nursery, good variety, full sun spot on the south-facing section of the porch. The plants grew. They got big enough to need staking. They flowered. And then they produced almost nothing—two small eggplants total across the entire summer, both of them bitter and spongy by the time I got to them.

The containers were too small. I knew this was a possibility when I planted them and I did it anyway because I didn’t have anything larger available that week and I thought maybe it would be fine. It was not fine. The roots hit the walls of the bucket fast, the plants stressed, and the flowers dropped before setting fruit. That’s the whole story. There’s no moment where I adjusted something and it turned around.

How to choose vegetables for container gardening (that actually fit your space)

After two seasons of trial and a fair amount of wasted soil and seedling money, here’s what actually works in containers and what size you need for each. We’re in Zone 7a in Tennessee, last frost around mid-April, first fall frost usually mid-October, so our window is long but July and August are brutal and containers dry out fast in that heat.

1. Cherry tomatoes — Minimum 10-gallon container. Varieties like Sungold or Black Cherry stay manageable. Stake early. These produced well for us from late June through September.
2. Bush beans — 5 gallons works fine. Direct sow, thin to about 3 inches apart. We got a solid harvest in about 55 days from a single large container.
3. Lettuce and salad greens — Even a window box works. These prefer our spring and fall temperatures; they bolt fast once it hits 85 degrees, so plan accordingly.
4. Radishes — Any container at least 6 inches deep. Fast, reliable, and useful while you’re waiting for slower things to produce. 25-30 days from seed.
5. Kale — 5-gallon minimum. Holds up through Tennessee summers better than you’d expect if you keep it watered. We grew Red Russian kale and it was still producing in November.
6. Peppers (bell and hot) — 10-gallon minimum. More on this below, because ours behaved in ways I still don’t fully understand.
7. Cucumbers (bush varieties) — 10-gallon, needs a small trellis. Spacemaster is a good compact variety. Give these full sun or they sulk.

The watering thing nobody agrees on

I’ve read enough about container watering to be genuinely confused. One school says water daily, containers dry out fast, don’t let them go overnight without moisture. Another school says deep and infrequent, let the top inch dry out, frequent shallow watering trains roots to stay near the surface. Both of these things cannot be entirely right and I have seen sources I trust contradict each other directly.

What I did: watered most things every morning, deeply enough that water ran out the drainage holes. The tomatoes seemed fine with this. The terracotta pots still felt dry by afternoon some days in July. I added a second watering for those and possibly overwatered two of them—one pepper dropped leaves for a week before recovering.

Ben thinks I overthink the watering. He stuck his finger in the soil and watered when it felt dry, which is the advice everyone gives but nobody explains well. His containers did about as well as mine. I kept a watering log. He did not. I’m not sure what conclusion to draw from that.

The morning versus evening debate is similarly unresolved. Morning is supposed to be better so leaves dry before nightfall. I watered in the evening twice a week because that’s when I remembered, and nothing died from it. Maybe it matters more in humid climates. Tennessee in August is extremely humid. I genuinely don’t know.

Our peppers somehow survived neglect

We grew Carmen sweet peppers and a cayenne variety in two 10-gallon fabric bags on the west end of the porch. That end gets inconsistent light—good morning sun, then the roofline cuts it off by early afternoon. I forgot to water them for four days in a row at one point in August because I got buried in a bookkeeping deadline and the kitchen garden took priority. The soil was bone dry when I got back to them. I watered thoroughly and expected damage.

They were fine. More than fine—the Carmen peppers produced steadily from late July until frost, more than we could use. The cayennes went absolutely feral and I’m still finding dried ones in a bowl on the kitchen counter. I have no real explanation for why these thrived on inconsistent attention when the eggplants in better containers with more reliable care produced almost nothing. Peppers are sometimes just like that, I think, but that’s not really an explanation.

Does this actually save money, or are we just romanticizing it?

I did the math once and then put the notebook away. Here’s roughly what our container setup cost in year one: eight fabric grow bags at $7 each ($56), three bags of potting mix ($42), seeds and two nursery transplants ($28), a bag of perlite ($14), and two tomato cages ($16). That’s $156 before we account for the water, which I didn’t actually calculate because I wasn’t sure how to attribute it.

We got cherry tomatoes, kale, peppers, some beans, and a handful of cucumbers. If I’d bought all of that at the farmers market or grocery store, it would have been—maybe $60 worth of produce? Probably less, honestly, because we had way more cayenne peppers than any two people need.

Year two is cheaper because we already have the containers. But we also replaced two of the fabric bags because they started to break down, so it’s not zero cost. I keep meaning to build a real comparison spreadsheet and I haven’t, because I suspect the answer is going to make me feel like we’re doing this for reasons other than economics, and I haven’t decided how I feel about that yet.

Soil keeps getting compacted—I still haven’t fixed it

By midsummer, the soil in most of our containers had settled and compacted enough that water was sheeting off the top instead of soaking in. I’d scratch the surface with a fork and it would help briefly. I’ve read about top-dressing with compost, mixing in more perlite at the start of the season, and using a different base mix entirely. I haven’t systematically tried any of these yet. The containers going into next spring still have last year’s compacted mix in them, which I know I need to address before planting. I’ll probably add perlite and some fresh compost and hope that’s enough. Hank walked across three of them last week and left paw prints an inch deep in the surface, which tells me the top layer is loose at least, even if what’s underneath isn’t.

Yesterday I emptied one of the fabric grow bags completely, broke up the old soil, mixed in about a third new potting mix and a handful of perlite, and repacked it. I have no idea yet whether that ratio is right or whether the compaction will come back just as fast this summer.