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Grow peppers + begonias from seed


Thank you to Park Seed for partnering with me on this post. As always, all words and thoughts are my own.

You might be asking yourself what begonias and peppers have in common that they’d end up in the same article. A lot actually, at least when it comes to starting them from seed, which makes them good seed-starting partners. 


Begonias and peppers are good seed starting partners for a few reasons.

  1. They should be started from seed at about the same time. Peppers should be started about 8 to 12 weeks before your last frost, a bit earlier for bell peppers and a little later for hot peppers, but I start them all at the same time. Begonias should be started about 10 to 12 weeks before your last frost. By batching it all at the 10-week mark I simplify things a bit, and particularly in the case of begonias, it’s OK to be a little on the late side because they’ll start performing in the garden quickly. If you don’t know your last frost date you can look it up here, or you can use the From Seed to Spoon app to just see the dates for starting various crops based on your location.
  2. Begonias and peppers are both heat lovers, so you can sow them in the same tray and give them the same conditions, about 70 to 80 degrees of bottom heat from a heat mat.
  3. As you grow them on inside under lights they’ll both appreciate a good amount of light, although you can remove them from the heat mat after they germinate.


If you’ve ever grown tomatoes from seed, you know most of what you need to know about peppers, and that’s not a surprise given that they are close relatives. Sow them about a quarter-inch deep in seed-starting mix or, if you’re using the Park’s Original Bio Dome like I did, you can just put them in the hole in the special sponges. 

I sow two pepper seeds to a cell and will thin the weaker seedling out later.

Keep seed-starting mix evenly moist or leave about an inch of water in the bottom of the Bio Dome, then cover them with a humidity dome and set them on a heat mat until they germinate in about seven to 10 days. 


Begonias are sown differently from peppers. Since the seeds need light to germinate, they should be sown right on the surface of the soil, or on top the Bio Sponge. 

But don’t expect to see the seeds on top the soil, because begonia seeds are incredibly small, almost like large dust particles. Anytime I’m dealing with a very small seed, I put the seeds into a small container (I used the lid of the toothpick jar in this case) and use a toothpick to pick up an individual seed then lightly wipe it on the surface of the soil. 

A toothpick makes picking up itty bitty seeds easier.

If you can find pelleted begonia seeds, it’s well worth the extra cost, although you’ll probably still need to do the toothpick trick.

Even pelleted begonia seeds are incredibly small.


After sowing, set the seed tray on a heat mat under a grow light (the begonias need light, but if you are only starting peppers, the light isn’t necessary until after they germinate). Keep them evenly moist and remove the dome when most of the seeds have germinated.

Cover cells with a humidity dome (one is included with the Bio Dome) until seeds germinate.

If you’re growing in cells with seed mix, you’ll need to transplant the small plants to pots (3-inch or so) when the roots fill the cell. Use regular potting mix at this point. You can also start using a dilute fertilizer at this point.

If you’re growing in a Bio Dome, you’ll want to fertilize with the included fertilizer pack but you may not need to move the small plants up to pots. When it’s safe to plant them outside, just pop them straight into the garden.


After a few years of growing peppers I’ve figured out what types of peppers I’ll actually use and that determined my selections.

  • Mexican Sunrise is a hot Hungarian pepper, with a nice amount of heat (which for me is enough to know it’s there and not enough to make me afraid to eat it). It’s tolerant of cooler conditions, which is helpful in my not-too-hot garden. It’s an All-America Selections winner, which means it’s been tested in trial gardens all over North America and found to be the best performing variety of its kind. I’ve found it to be extremely productive.
Mexican Sunrise
  • Pot-a-peño is a small jalapeño pepper perfect for containers, but also great in gardens where you don’t want to dedicate a lot of space to peppers. It has great flavor and, although I’ve grown plenty of super hot peppers, this is at a level that I love to use to actually flavor dishes, rather than use as a party game. You can eat them green or red. This is also an All-America Selections winner.
  • Candy Cane Red peppers were just too pretty to pass up. This sweet snacking pepper is a new variety for me and it has variegated foliage and fruit. The peppers ripen to a variety of colors, including green and red striped. You can’t buy that in the grocery store!
Candy Cane Red
  • Kitchen Minis Fresh Bites Yellow are the cutest little pepper plants. They were new last year and I grew a couple of them in a planter filled with quick-grab edibles by the back door. Sure, the peppers were delicious, but they were beautiful as well, and that is reason enough to grow these small plants.
Kitchen Minis Yellow

Both of the begonias I’m growing are new-to-me varieties that I’m eager to add to the garden.

  • Viking Explorer Rose on Green is another All-America Selections winner, and a sister to other Viking Explorer begonias I’ve grown and loved in the past. It grows into a sizable plant—20 inches high by 24 inches wide—that is absolutely covered in flowers all season. Although it will do best in dappled sunlight, it’s quite adaptable to different lighting situations. The seeds are pelleted.
Viking Explorer Rose on Green
  • Pizzazz White is exactly the kind of annual I like to have lots of on hand to scatter around the garden to fill holes and brighten up dark corners. It’s a bedding begonia that I’ll use for those empty, front-of-the-border spots in the shade.
Pizzaz White

In most areas, it’s not too late to start either of these, alone or together.

For limited time, use the promo code IMPATIENTGARDENER15 for 15% off your Park Seed order.

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