Easy Way to Start Tomatoes
How I Start Tomato Seeds in Cups (Simple, Low-Stress, and Effective)
Starting tomatoes from seed doesn’t have to involve fancy trays, special equipment, or complicated steps. Over the years, I’ve learned that simple systems are often the most reliable—and this is one I use year after year.
If you’re new to seed starting or just want an easy, repeatable method, here’s exactly how I start my tomato seeds using everyday cups and seed-starting mix.
Step 1: Prep Your Cups (Drainage Matters)
Before anything goes into a cup, it needs drainage. I drill or poke holes in the bottom so excess water can escape. This prevents soggy soil and unhappy roots later on.
Once the holes are in, I label each cup with a Sharpie. I write:
The plant name
The date I started the seeds
Trust me—after a few weeks, everything looks the same, and you’ll be glad you labeled.
Step 2: Moisten the Seed-Starting Mix
I always wet my seed-starting mix before planting. I pour it into a large container and add water slowly, mixing as I go.
What you’re looking for is a brownie-mix consistency—moist, but not dripping. When you squeeze it, it should hold together without water running out.
This step helps ensure even moisture around the seeds without needing to water again right away.
Step 3: Fill and Firm the Cups
I scoop the moist soil into each cup and gently firm it down, especially near the bottom. This removes air pockets and gives roots something solid to push against as they grow.
You don’t want to compact the soil hard—just enough so it’s settled and supportive.
Strong roots start with good soil contact.
Step 4: Plant the Seeds
I usually plant two tomato seeds per cup, spacing them slightly apart. This gives me options later. If both seeds germinate, I can either:
Snip one off
Or carefully separate them once they grow
Any extra seeds go right back into the packet so nothing is wasted.
I tear the corners off the seed packets—yes, it’s a little messy—but those packet corners become handy labels later.
Step 5: Cover and Firm Gently
Once the seeds are in place, I press them slightly into the soil so they make good contact. Then I add a light layer of loose soil over the top—just enough to cover them.
I gently firm the surface again so the seeds are snug but not buried too deeply.
Because the soil is already moist, I do not water again at this stage. Overwatering right now can do more harm than good.
Step 6: Bend the Seed Packet Corners
Those seed packet corners I tore off earlier? I bend them to keep the seeds in the packets when I store for next year.
Simple, reusable, and effective.
Step 7: Move to the Greenhouse (or Warm Spot)
Once everything is planted and labeled, the cups go into my greenhouse (which is inside at this time of year). You can also place them in a warm, bright location indoors. Placing clear plastic covers loosely over the cups helps keep the soil surface from drying out too quickly.
For reference, these tomatoes were started on March 31, which works well for my growing season.
See this in video here: https://youtu.be/V9bujBDCSz4
Final Thoughts
This method isn’t fancy—but it works. It’s flexible, affordable, and perfect for home gardeners who want healthy tomato plants without overthinking the process.
If you’re just getting started, remember:
Keep it simple
Label everything
Don’t overwater
Focus on strong roots early
Learn and grow and happy planting 🌱