Ever wondered what it’s like to watch a tomato plant grow from seed to harvest in a few minutes? If you’re dreaming of homegrown tomatoes (and honestly, who isn’t?), you’re in for a treat. In this guide we’ll walk through exactly how to grow tomatoes from seed step by step – and I’ll show you the whole journey as a tomato timelapse I filmed myself.
TL;DR – How to Grow Tomatoes from Seed
- Start seeds indoors in a warm (21–27°C), bright spot; they germinate in 5–10 days.
- Pot up at 2 sets of true leaves and bury part of the stem for extra roots.
- Harden off, then plant out in full sun after the last frost.
- Stake or cage early; on vining types, pinch out the side shoots (suckers).
- Feed (go easy on nitrogen) and water steadily to avoid blossom end rot and cracking.
- Cherry tomatoes are the easiest start – I filmed mine as an 83-day timelapse (below).
The Tomato Timelapse: 83 Days of Growth in Minutes
There’s something great about watching nature in fast-forward. I captured the whole process of growing cherry tomatoes from seed to harvest in an 83-day timelapse: tiny seeds turn into delicate seedlings, then vigorous vining plants covered in flowers, and finally juicy tomatoes.
Seeing it compressed into a few minutes makes every growth stage click – germination, first true leaves, branching, flowering, pollination and fruit ripening. It’s oddly soothing and genuinely educational, especially if you’re about to grow tomatoes from seed yourself.
Why Grow Tomatoes from Seed?
Why bother growing tomatoes from seed when you can buy seedlings from a nursery? A few good reasons:
- More variety – grow unique, heirloom and specialty types rarely sold as seedlings.
- Better control – you know exactly how your plants were grown, from soil mix to fertilizer.
- Cost-effective – one seed packet can produce a whole army of tomato plants.
- More fun – watching a seed turn into a fruit-loaded jungle is extremely satisfying, especially on a timelapse.
Cherry tomatoes are great for beginners – fast, productive and forgiving. Once you’ve got the hang of it, move on to beefsteaks, paste tomatoes and rare heirlooms.
How to Grow Tomatoes from Seed, Step by Step
Ready to start your own tomato-growing adventure? Here’s the process from sowing to harvest.
- Choose your seeds – pick a variety that fits your space and taste. Cherry and compact bush types are perfect for balconies and containers; indeterminate (vining) types need more space and support but reward you with continuous harvests.
- Prepare the soil – use a light, well-draining seed-starting mix, fine-textured so the tiny roots move easily. Fill trays or small pots, leaving about 1–1.5 cm at the top.
- Plant the seeds – sow about 0.5 cm (¼ inch) deep, cover lightly with soil or vermiculite and mist so you don’t wash them away.
- Germination – keep trays warm, ideally 21–27°C (70–80°F), and the mix evenly moist but never soggy. Seeds usually germinate in 5–10 days.
- Light & early care – as soon as seedlings appear, give them plenty of light. A south-facing window works, but grow lights prevent stretching. Water when the top layer starts to dry.
- Potting up – at 2 sets of true leaves, transplant into larger pots. You can bury part of the stem to encourage extra roots – tomatoes love that.
- Hardening off – before planting outside, introduce plants to outdoor conditions gradually: start with a few hours of shade and light breeze, then increase sun and time over a week.
- Final planting – once frost risk is gone, plant in their final spot with rich soil, deep holes and enough spacing (usually 40–60 cm, depending on variety).
- Care, support & pruning – water regularly, add stakes or cages early, and remove lower leaves that touch the soil to reduce disease. On vining varieties, prune the side shoots (suckers) to keep plants in check.
- Harvest time – tomatoes are ready when fully coloured, slightly soft and easy to pick. Then eat them straight off the plant, toss them in a salad, or snack on them while watching your timelapse.
Essential Growing Conditions for Tomatoes
Tomatoes aren’t complicated, but they are a little picky. Get the basics right – substrate, temperature, watering and light – and they’ll reward you with a heavy, sweet harvest.
Substrate
Tomatoes thrive in well-draining, nutrient-rich soil. Good vegetable soil mixed with compost or well-rotted manure works well. Aim for a slightly acidic to neutral pH of 6.0–7.0. In containers, use a high-quality potting mix made for vegetables.
Temperature
Tomatoes love warmth. Ideal daytime temperatures are 21–29°C (70–85°F), with nights above 13°C (55°F). Cold soil and frosty nights stunt or kill young plants, so don’t rush them outside.
Watering
Consistent moisture is key. Tomatoes need about 2.5–5 cm (1–2 inches) of water per week, depending on heat and wind. Water deeply at the base, not on the leaves, to reduce fungal problems. Keep the schedule steady – big swings between dry and wet cause blossom end rot and cracked fruit.
Light
Tomatoes need full sun: at least 6–8 hours of direct light per day, more is better. On a balcony or indoors, pick the brightest spot or supplement with grow lights. Too little light makes plants leggy with fewer fruits.
Fertilization
Tomatoes are heavy feeders. Start with a balanced fertilizer or compost at planting, then switch to a tomato feed higher in potassium and phosphorus once flowering begins. Go easy on nitrogen – too much gives you giant plants with very few tomatoes.
Tomato Timelapse & Filming Tips
If you’re into timelapse videos, tomatoes are perfect subjects: they grow fast, change visibly almost every day, and the switch from green to red looks amazing on camera.
Set up your camera on a stable tripod, use an intervalometer, and keep the frame exactly the same throughout the grow. For the exact camera, lens and lights I use, see my Plant Time-Lapse Equipment Guide.
Final Thoughts
Growing tomatoes from seed isn’t just about the harvest – it’s the whole journey, from the first tiny sprout to biting into a sun-warm cherry tomato. Add a timelapse on top and you get both delicious food and a satisfying visual project. Whether you’re a total newbie or a seasoned plant nerd, start a few seeds, document the process, and enjoy watching your own tomato jungle come to life – one frame at a time. 🍅
Frequently asked questions
Seeds germinate in about 5 to 10 days in warm conditions, and most varieties ripen roughly 60 to 85 days after transplanting. Cherry types are usually the fastest.
Usually too much nitrogen and not enough sun. Ease off high-nitrogen feed, switch to a tomato fertilizer higher in potassium, give the plant full sun, and gently shake the flowering trusses to help pollination.
A dark, sunken patch on the bottom of the fruit, caused by uneven watering disrupting calcium uptake. Water steadily and evenly and mulch around the plants to keep soil moisture consistent.
On indeterminate or cordon (vining) tomatoes, yes – pinch out the suckers so the plant puts its energy into fruit. Determinate or bush types are usually left unpruned.
Further Reading on Growing Tomatoes
- How to Grow Tomatoes – Royal Horticultural Society
- Growing Tomatoes in the Home Garden – Iowa State University Extension
More Plant Projects You Might Like
- How to Grow Cucumbers from Seed – another warm-season favourite for the summer garden.
- How to Grow Lettuce from Seed – the perfect cool-season salad partner.
- Growing Broccoli from Seed – another seed-to-harvest veggie timelapse.
