Plant Growing Guides

Plant growing guides begin with six skills, so this page shows you how seed, sowing, watering and potting mix work together to grow a healthy plant.

Plant growing is the set of six skills that decide whether a seed becomes a healthy plant: sowing at the right depth and soil temperature, transplanting without root damage, watering by soil moisture, choosing a pot and mix that drain, propagating from cuttings, and timing every job to frost and soil warmth.

This guide is your map to every step. Each section below gives you the short answer, the reason behind it, and the guide that goes deep. If you’re new, read in the order shown, because the skills follow a plant’s life from seed to pot to garden to season’s end. If you already grow well, use the symptom table near the end to find your one weak link, because a single poorly handled stage, usually watering or timing, causes most failures. After the basics, you’ll move naturally to trees, vegetables and herbs and soil, water and fertilizer.

How plant growing skills depend on soil, water and timing

Tomato and pepper seed need warmth of 21°C to germinate, while lettuce and spinach prefer cool soil, so sow the two groups at different times. Compost feeds seedlings and improves loam, and perlite drains water and prevents damping-off. Bean and pea need 3 to 5 cm of cover, whereas carrot and radish need only 1 cm, and gravel around the rows blocks the slugs that damage lettuce and bean.

Basil needs light and warmth, mint tolerates shade, and rose needs 6 hours of sun while hosta tolerates shade. Sand drains clay and mulch protects roots and reduces weeds, but overwatering kills succulent and cactus and clay holds water and causes root rot, so loam is the safer middle for most pots. Cuttings of rosemary and lavender need sharp drainage, and pothos roots in water. Harden off seedlings for 7 to 10 days so tomato and pepper avoid shock, sow lettuce every 2 weeks and you’ll harvest for months, and check your extension service or the rhs for local sowing dates.

What questions does this guide answer?

People search this topic in six different ways: what something is, how to do it, when to do it, why it failed, which option is better, and what to do next. The table gives a short answer to each common question and the guide that answers it fully.

What does each growing guide cover?

Sowing seed: How to plant seeds step by step

Seed holds a fixed energy store and germinates only when moisture, warmth and air are right. Sown too deep, it exhausts its reserves before reaching light. Sown into cold, wet soil, it rots. The guide sets out depth, spacing and temperature for common crops, how to test old seed on damp paper, and how to avoid damping off. It’s the starting point for everything that follows.

Moving plants: How to transplant seedlings

A seedling’s fine root hairs do most of its water uptake and are the first thing lost in moving. Handle by the leaves, never the stem, keep the root ball intact, plant at the same depth as before and water straight away. Hardening off for 7 to 10 days and moving in the evening or on a cloudy day reduce the shock. The guide also covers spacing and aftercare.

Water management: Watering plants the right way

Roots need oxygen as much as water, so the aim is moist soil with air spaces, not constantly wet soil. Deep watering encourages roots to grow downward, while frequent light watering keeps them near the surface where they dry out. The guide covers the finger test, how amounts scale with pot size, soil type and weather, and when to water in the day.

Containers and growing media: Choosing pots and potting mix

Drainage holes matter more than pot material. Garden soil compacts in containers, so potting mixes use bark, coir, perlite and compost to keep air in the mix. Succulents need a gritty, fast-draining blend and moisture-loving plants a richer mix. The guide compares pot materials, sizes and mixes, and explains why a layer of gravel at the bottom doesn’t improve drainage.

Making new plants: Propagation by cuttings

New roots form from tissue at and just below a node. Soft-stemmed houseplants often root in two to eight weeks, while woody shrubs take longer and depend on the type of cutting and the season. Keeping cuttings humid but not wet, with a clean cut and no submerged leaves, prevents most rot. The guide includes species timing and rooting media.

Timing: The seasonal planting calendar

Two numbers drive planting dates: average last spring frost and soil temperature. Cool-season crops such as peas and spinach go out 2 to 6 weeks before the last frost, while warm-season crops wait until 1 to 2 weeks after it. The guide shows how to count back from transplant day to sowing day and how to build your own calendar.

Reading and planning: Reading plant signals and The first garden plan

Leaf colour, posture and growth tell you what a plant lacks, and the guide on plant signals teaches you to tell water, light, feed and pest problems apart before acting. The first garden plan then turns the skills into a layout: what to plant where, how much space, and which crops suit a first season.

Lights: Grow Lights for Seedlings: Choosing, Hanging and Timing the Light

The guide compares LED and fluorescent lights, gives hanging heights and hours for each crop, and shows how to read pale, leggy or scorched seedlings.

Tools: Best Gardening Tools for Beginners

The guide lists the six tools to buy first, explains how to judge steel, handles and weight, and shows which tools to skip until a real job calls for them.

How do you answer the most common sowing questions?

How do you test whether old seed is still alive?

Place ten seeds on a damp paper towel, slide it into a bag, keep it warm and check after the usual germination time for that crop. If eight sprout, viability is about 80 per cent, so sow a little thicker. If fewer than five sprout, buy fresh seed. Most vegetable seed stays usable for two to five years when kept cool and dry, but onion, parsnip and parsley seed lose viability faster.

Why do seedlings grow tall and thin?

Seedlings stretch toward light when the light is too weak. A windowsill behind glass gives less light than it looks, so add an LED grow light 10 to 15 cm above the leaves for 14 to 16 hours a day, and raise it as the seedlings grow. Cooler temperatures also slow stretching.

How do you stop damping off?

Damping off is a group of fungus-like organisms that rot seedling stems at soil level in cool, wet, stagnant conditions. Use clean trays, fresh seed compost, water from below, give the tray airflow, and sow thinly. Once a seedling has collapsed it won’t recover, so remove it and let the surface dry slightly.

What is a good hardening-off schedule?

Hardening off takes 7 to 10 days. Start in a sheltered, shaded spot and increase exposure each day. Protect tender plants from cold nights and strong wind throughout.

How often should each type of plant be watered?

No plant should be watered on a fixed schedule, but the soil condition you aim for differs by type. Use this as a guide to what to check, not a calendar.

Which potting mix suits which plant?

These blends are typical starting points. Always use a bagged potting mix, not garden soil, and adjust to how fast your pots dry.

How long do cuttings take to root?

How do you count back from planting day to sowing day?

Many crops are sown indoors so seedlings are the right size on planting day. Count backward from your transplant date, which is usually around or after your last frost date, depending on the crop.

Example: if your last frost is around 15 May and you plant tomatoes out a week later, sow them about 6 to 8 weeks before that, in late March to early April. Build the full list for your own site using the seasonal planting calendar.

How do the six skills affect each other?

These skills are linked by cause and effect. Poor drainage in the mix causes root rot, which causes wilting that looks like thirst, which leads to more watering and worse rot. Cold soil slows germination, which keeps seed in the ground longer, which raises the risk of rot. A thin root ball causes transplant shock, which stalls growth for days. Understanding these chains is faster than memorising rules.

• Mix drainage controls whether roots get air, so it comes before watering technique.
• Watering depth controls root depth, which controls drought tolerance later.
• Hardening off controls leaf thickness, which controls water loss after transplanting.
• Frost date and soil warmth control when every other skill matters.
• Propagation repeats all of these on a cutting that has no roots yet.

Which guide helps when something goes wrong?

What soil temperature does each crop need?

Soil temperature, not the calendar, decides when seed germinates. Use a soil thermometer pushed 5 cm deep in the morning. These are typical minimums for germination, and many gardeners sow a few degrees above them for faster, safer results.

How do you choose between pot materials?

What do you do in each season?

What do the key terms mean?

• Germination: the point at which a seed breaks dormancy and a root emerges.
• Damping off: a fungal and water mould disease that rots seedling stems at soil level.
• Hardening off: gradual exposure of indoor-raised plants to outdoor conditions.
• Node: the stem joint where leaves and roots form, and where cuttings are cut.
• Last frost date: the average date after which frost becomes unlikely in your area.
• Potting mix: a soil-free blend designed for drainage and aeration in containers.

What are the most common growing mistakes?

1. Following the calendar, not the soil. Cold soil rots seed whatever the date says, so check soil temperature before you sow warm-season crops.
2. Watering on a schedule. Plants use different amounts of water as weather and growth change, so test the soil instead of watering every Tuesday.
3. Skipping hardening off. Seedlings moved straight outdoors scorch and stall, so allow a week or more.
4. Using garden soil in pots. It compacts and drains poorly in a container, so use a potting mix.
5. Burying stems and crowns. Planting too deep suffocates the crown of many plants, so match the depth they grew at before.

Where should you go next?

When the six skills feel routine, pick the plant group you care about: trees for long-lived structure, vegetables and herbs for food, flowers for colour and pollinators, or soil, water and fertilizer to improve the ground everything grows in. A written log of sowing dates, weather and results turns each season into data you can use the next year.