Gardening Terms Explained

Acclimatisation is when plants adjust to cooler (often outdoor) conditions. Often heard at the beginning of spring, before planting out plants that have been growing indoors over winter. Also see 'hardening off' which is the technique to help plants acclimatise for cooler conditions.

Acid soil is when the PH is lower than 7. Some plants, like nasturtiums or parsley, need acidic soil to thrive. Also see Alkaline soil.

Aerating is the practice of loosening compact soil, usually with a trusty garden fork to allow air in. This benefits your plants giving them good drainage and fertile ground to grow big and strong.

Alkaline soil is when the PH is higher than 7. Plants like lavender and forget-me-nots do really well in alkaline soil. Also see Acid soil.

A plant that will sprout, grow, flower, seed and complete its life cycle in a year. See also 'Perennial' and 'Biennial'.

Annual wildflowers grow, flower and set seed all in one year. Many self-seed freely, scattering new generations across the garden each season.

Bedding plants, including violas and sweet peas, provide immediate bursts of transient hues. They are ideal for garden beds, border landscapes, plant containers, and hanging baskets.

Bee-friendly flowers produce open, easily reached blooms full of nectar and pollen. They're crucial for supporting native bee species and healthy garden ecosystems.

Biennial is a plant that has a 2 year life cycle. Growing in the first year and flowering and going to seed before dying off in the second.

Bokashi is a composting technique that comes from Japan, where the name means "fermented organic matter". It's different from usual composting in that it quickly breaks down food waste in a sealed container, using a special inoculant.

Bolting is when vegetables and herbs go to seed before you would like them to. Often brought on by stress — like a cold spell, lack of water or particularly hot conditions. It normally makes the vegetables and foliage woody, bitter to eat and virtually unusable. Very common with lettuce leaves and spinach.

Broadcast sowing involves scattering seeds across an area, rather than neatly planting them in trenches or straight rows.

In botany, a bud represents an immature or nascent shoot, typically found in the junction of a leaf or at a stem's end. A bud, once established, can either stay dormant for a certain period or start forming a shoot right away.

Butterfly-friendly plants attract adult butterflies with nectar-rich blooms and often provide larval foodplants for caterpillars too.

Yellowing plant leaves due to insufficient chlorophyll. Chlorosis can be caused by a number of issues, including disease, damaged or bound plant roots, highly alkaline soil, inadequate drainage, and/or nutrient deficiencies.

Coir is a natural fibre derived from the exterior husk of coconuts. It assists in maintaining soil moisture while simultaneously promoting drainage and aeration.

In gardening terms, a cold frame is like a mini greenhouse. It's a low-to-the-ground box with a clear top, designed to keep your plants safe from harsh weather. The clear top lets in the sunshine while keeping warmth from escaping, especially when it gets chilly at night.

Plants and vegetables grown near one another for mutual benefits such as attracting pollinators or deterring pests. Try growing chives near carrots to deter carrot fly, or sweet peas near broad beans to attract pollinators, or basil near tomatoes as they both love the same growing conditions.

When we talk about a plant's crown, we're referring to everything you can see above the ground — the stems, leaves, and any flowers or fruits. When a bunch of plant crowns grow together in one spot, we call it a plant community canopy.

Damp shade describes areas that stay cool, shaded and consistently moist — often at the bottom of slopes, near downpipes, or beside water butts. It's perfect for lush foliage plants like ferns and moisture-loving perennials.

Dappled shade is light that's filtered through leaves, fences or structures, creating a shifting pattern of sun and shade. Many woodland-style plants thrive in these conditions, enjoying gentle light without the scorch of full sun.

The time from when seeds are sown until the plant should be ready to harvest. A plant description or seed packet will usually outline the specific variety's expected growth timeline, though different care and growing conditions can lead to some variation.

Deadheading is removing a plant's spent flower heads, often as they start to seed. It can encourage new blooms. Usually, you remove the flower up to the node below it.

Deadheading is cutting off spent flowers to encourage the plant to bloom again, often flowering for a second time before the end of the season, extending the flowering period.

Deep shade describes areas that receive very little direct sunlight — such as under dense trees, behind walls or in narrow side returns. Only the most shade-tolerant plants will thrive here, so it's worth choosing carefully.

Direct sowing refers to planting seeds straight into the garden (whether in-ground or containers), where they will grow and thrive.

A drill is a straight, slim ditch dug in the ground where seeds are planted or young plants are placed.

Dry shade is found where tree roots, walls or overhangs keep soil both shaded and short on moisture. It can be one of the trickiest spots to plant, but certain perennials and groundcovers are well adapted to it.

Earth up refers to the practice of piling soil around the base of a plant. It helps to block light, safeguards against frost and stimulates root growth from the stem. It's a technique frequently used when cultivating potatoes.

Espalier is a time-honoured gardening technique where you prune and tie branches of a woody plant, like a fruit tree, onto a frame. It's a way of controlling how the plant grows to boost fruit production.

An evergreen is a plant that maintains its foliage year-round. Evergreen species keep their leaves for over a year, continuously replacing older leaves over a gradual period.

F1 Hybrid is the first generation of plants produced by crossing two different purebred varieties. These hybrids are known for being vigorous and uniform. However, if you plant seeds from F1 Hybrids, they won't grow up to be the same as their parent plants.

Forcing is spurring growth when it's not the season — coaxing a plant to flower or fruit ahead of its normal schedule. It's mostly done in greenhouses or on a warm windowsill where you can manage light and temperature.

A position in your garden that gets 6 hours or more of direct sunlight per day.

Germination is when a seed begins its physical changes, growing roots and leaves — the moment you've cracked its code to get it to grow.

The germination rate is the percentage of seeds expected to sprout under the right conditions.

Grafting is a technique where you join two plants together so they grow as one. The top part (the scion) is usually a branch or stem. The bottom part (the rootstock) is the one with the roots. The key is ensuring the vascular tissue of both plants connects well for the graft to take.

Hardening off is the method of gradually acclimatising sprouts and plants grown indoors or in a greenhouse to outdoor temperatures. Without hardening off, your sprouts may get stressed, wilt or die off. See also 'Acclimatisation'.

Plants that are tough enough to survive winter without any protection. Ordinarily this means the plant is capable of withstanding outdoor winter temperatures down to -15°C.

A herbaceous plant is a type of perennial that doesn't develop woody stems or branches. These plants often retreat into dormancy during winter through their underground roots or woody base, returning to active growth in spring.

A node is the the area on a stem (often swollen) at which point a leaf, leaf bud or shoot will emerge. The internode is simply the area between two nodes. It is a term often referred to when propagation advice is give, a nodal cutting is taken directly below the node where there is most hormonal activity. An internodal cutting is taken in the internode region.

Who is John Innes, and why does he have such a compost monopoly? Turns out he isn’t a brand, he was the 19th century founder of a horticultural research institute. The composts named after him are soil-based recipes formulated for propagating seeds (1), potting on seedlings (2) and mature plants (3), with fertiliser content increasing from 1-3.

The last frost date marks the final cold spell in spring where you live, so you know when it's safe to plant out tender plants. These dates differ based on your location — the region, altitude, and whether you're in the city or the countryside.

"Leggy" refers to seedlings that have grown too tall and thin, usually from reaching for light. These seedlings tend to be weaker and more likely to fall over. Avoid legginess by ensuring seedlings get plenty of bright light.

A fertile soil mixture made up of roughly equal amounts of sand, silt and a little less clay (about 40-40-20%). Loam is considered ideal for retaining nutrients well and absorbing water while still allowing excess water to drain away.

Meadow sowing is the process of scattering wildflower and grass seed over prepared ground to create a natural or semi-natural planting.

Micro greens are young, leafy vegetables and herbs harvested whilst they are still sprouts. With their small tender leaves, they often have a concentrated flavour and are rich in nutrients.

Mulch is material spread over the ground and around plants to keep the soil moist, suppress weeds, and improve the soil over time. You can use well-aged manure, compost, leaf mould or even gravel.

N-P-K stands for the three key plant nutrients: nitrogen (N), phosphorus (P), and potassium (K) — also called macronutrients. The three numbers on a fertiliser bag refer to the ratio of these nutrients.

Wildflowers that naturally occur in the UK landscape, supporting local ecosystems and pollinators.

Planting in a loose, informal way that mimics meadows and wild habitats.

Nectar-rich plants produce plenty of sweet nectar that fuels pollinators. They're the backbone of wildlife-friendly gardens.

Plant varieties that produce seeds that are 'true to type', growing into near identical plants to the parent. Unless stated as a hybrid, a plant is often open pollinated. Choosing open pollinated varieties supports seed biodiversity.

Partial shade usually means a spot that gets around 3–6 hours of direct sun a day, often morning or late afternoon light. It's a sweet spot for many flowers, herbs and leafy plants that need protection from the strongest midday sun.

Perennial means a plant that lives for more than 2 years. Also see 'Annual' and 'Biennial'.

A perennial wildflower is a species that returns year after year. It goes dormant over winter and regrows in spring, helping build a long-term, self-sustaining meadow.

Pinching out means removing the growing tips of a young plant to encourage it to sprout side shoots. It's a neat trick to make plants grow in a fuller, bushier way and produce more flowering stems.

Pollination is the process of moving pollen from one flower to another. It can happen with help from the wind, insects, animals, or by hand.

A connected pathway of pollinator-friendly plants that supports bees, butterflies, and other beneficial insects.

Plants described as pollinator-friendly offer abundant nectar and pollen for bees, butterflies, hoverflies and other beneficial insects.

Pot on means taking a plant out of its current container (usually because it's grown too big for it) and moving it into a new, roomier one so it can keep growing.

Pricking out is when you move seedlings from pots or trays to give them more space to grow, normally when their first set of true leaves have appeared.

Propagation is the act of producing new plants using a range of techniques, such as growing from seeds, using cuttings or grafts, or dividing existing plants.

Root rot is a fungal disease that affects the roots of plants, often causing them to wither and die. It is frequently caused by overwatering or plants in pots without adequate drainage.

The mix of roots and soil that comes with a plant when you remove it from its pot or lift it from the ground.

Scarifying, also called de-thatching, clears accumulated dead grass (thatch) from your lawn. Getting rid of the thatch lets water and nutrients reach the soil and helps healthy grass thrive.

A seed mix combines several varieties in one packet for easy, blended planting — often seen in wildflower or salad mixes.

Seed packets include vital information such as sowing times, spacing, germination temperature and expected harvest dates.

Seed viability is a seed's ability to germinate successfully — influenced by age, storage conditions and seed type.

A plant in its early stages of life, grown from a seed.

Self-seeding plants scatter their own seed, allowing new seedlings to appear each season — a natural way for gardens to fill out with minimal effort.

Sowing depth is how deep a seed is planted — follow packet guidance, as tiny seeds often need light to germinate and should be sown on the surface.

Spacing is the distance you leave between seeds in a row, and between rows. Larger plants need more room than small ones — follow packet guidance to avoid competition for light and nutrients.

A spacing guide outlines the ideal distance between plants so they have room to grow without competing with one another.

Stratification simulates the natural cold and damp conditions a seed would experience over autumn and winter, breaking its dormancy. Seeds are placed in a moist, cold environment (often the fridge in a damp bag) before being brought out to sprout.

Succession sowing is a gardening strategy where you plant new seeds at regular intervals throughout the growing season, staggering harvest times for a steady, prolonged yield rather than a glut. It is particularly useful for fast-growing vegetables like radishes, beans, or salad greens.

Successional flowering describes plants blooming at different times so there's colour — and food for pollinators — from early spring through to late autumn.

Thinning out is removing surplus seedlings that have sprouted too close together, allowing the strongest ones to grow with less competition for light and nutrients.

Tilling means breaking up the soil to prepare it for planting. Effective tilling loosens soil to a depth of around 8–10 inches, creating an aerated bed for seeds or seedlings.

Tilth is the top layer of soil that has been broken down into small, loose pieces through digging and raking — the ideal fine, crumbly texture for sowing seeds.

Transplanting is the process of relocating a young plant, typically from a pot, to its final spot in the garden where it's set to flourish.

Vermiculite is a natural mineral heated to high temperatures, resulting in lightweight, super-absorbent flakes. Mixed into a growing medium, it boosts aeration and helps retain moisture and nutrients.

Waterlogged soil or pots have an excess of water with nowhere to drain. Best avoided by using free-draining compost and, for pots, lifting containers off the ground in winter.

A weed is simply a plant that's ended up somewhere it's not wanted or supposed to be.

A wildflower meadow is a mix of native grasses and flowering plants grown together to create a natural, biodiverse habitat. Meadows are rich in pollen and nectar, supporting bees, butterflies and beneficial insects.

An area planted with wildflower seeds to attract pollinators and increase biodiversity.