🌱✗ Tested and false“Squash spacing is the same whatever variety you grow”
RHS gives two different figures depending on growth habit: 90cm apart for bush varieties, 1.5m for trailing ones, roughly two-and-a-half times the space. Garden Organic gives a narrower 60-90cm range for the same transplant step, without distinguishing habit at all.
Our read Squash gets sold and thought of as one vegetable, so it's an easy step to assume one spacing figure covers it. Bush and trailing types actually use the ground so differently that the same distance would either waste space or starve the plants, depending which way you got it wrong.
What to do: Check whether your variety is a compact bush type or a sprawling trailing type before spacing it, rather than assuming a single figure applies across the board.
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- RHSBush varieties: 90cm (3ft) apart. Trailing varieties: 1.5m (5ft) apart
“Powdery mildew on squash means you've been overwatering”
Insufficient moisture encourages powdery mildew on squash, not excess. The advice is to water regularly and directly to the soil, avoiding wet foliage, which addresses both fungal risk and drought stress at once.
Our read Mildew looks like a damp-conditions problem, and plenty of fungal diseases genuinely are, which makes it easy to assume the fix is less water rather than more. Squash runs the other way.
What to do: If powdery mildew appears, check whether the plant has been going short of water rather than cutting back on watering, and keep water off the leaves either way by watering at the base.
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- RHSInsufficient moisture encourages powdery mildew
“Winter squash and pumpkins are ready to harvest once they've grown to a good size”
Ripeness is tested by colour and sound, not size: fully coloured skin, and a hollow sound when tapped. A winter squash or pumpkin can reach full size well before its skin has hardened enough to store.
Our read Size is the obvious, visible signal, so it's the one most people check first. Storage life depends on skin hardness and full colour developing, which happen after the fruit stops getting noticeably bigger, not alongside it.
What to do: Judge readiness by colour and the tap test, not size, and leave the fruit on the plant as long as the season allows for the skin to fully harden before the first frost.
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- Garden OrganicCut with 10cm stalk when fruit have coloured and sound hollow when tapped, but before frosts
“Cutting winter squash or pumpkins close to the fruit gives a neater result”
RHS specifies leaving at least 10cm of stem attached on both its squash and pumpkin pages independently, and Garden Organic's combined guide agrees: cutting too close leaves a soft area on the fruit that's prone to rotting in storage.
Our read A short, tidy stem looks like better workmanship, the way a close, clean cut usually is elsewhere in the garden. Winter squash and pumpkins punish exactly that instinct: the stem is protecting the one point the fruit can't seal itself.
What to do: Leave a generous stem, at least 10cm, when cutting winter squash or pumpkins for storage, even if it looks untidier than trimming close.
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- RHSIf you cut too close to the fruit, it leaves a soft area on the fruit that is prone to rotting
- RHSCut the pumpkins from the plant with at least 10cm (4in) of stem still attached. If you cut too close to the fruit, it leaves a soft area on the fruit that is prone to rotting
- Garden OrganicCut with 10cm stalk
“Pumpkins are a completely different plant from squash, just marketed differently”
Pumpkins are a type of winter squash, not a separate plant, per RHS's pumpkin page. RHS still maintains two separate grow-your-own guides for them, because the practical concerns genuinely differ: pumpkins get a giant-fruit growing technique and no AGM varieties at all, while squash gets a summer/winter split and six AGM picks.
Our read Different names, different shapes, and a Halloween-specific reputation all make pumpkins feel like their own category. Botanically they're not: RHS still treats them as separate pages because growers reach for them with different goals, not because they're different plants.
What to do: Treat pumpkin and squash growing advice as interchangeable wherever it doesn't specifically depend on fruit size or storage use, and expect pumpkin-specific guidance to focus on carving suitability and giant-growing technique that a general squash page won't cover.
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- RHSPumpkins are a type of winter squash, traditionally with large, rounded, orange fruits
“Winter squash and pumpkins can go straight into storage off the vine, no curing needed”
Standard advice is to cure squash and pumpkins before storing them, not store them straight off the plant.
What to do: After harvest, lay pumpkins and winter squash out in the sun (or a greenhouse/coldframe) for a week to 10 days to harden and cure the skins before moving them into cool storage.
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- RHSPrepare pumpkins for storing by laying them out in the sun for a week to 10 days, either outdoors or in a greenhouse or coldframe, to harden (or cure) the skins.
“Dig sand or grit into heavy clay to break it up”
The quantities involved make this hopeless at garden scale. Meaningfully diluting a soil that is 40 per cent clay takes around 250kg of grit or gravel per square metre. A barrowload does nothing, and adding modest amounts can destabilise the structure and leave the ground harder to work than before you started.
What to do: Add bulky organic matter instead: manure or composted bark, dug in generously. Raise beds to lift roots above the wet, and consider not digging at all. Those three do what the sand was supposed to do, and they compound each year rather than needing repeating.
In Scotland: Heavy clay runs right through the Central Belt, so this is one of the most expensive mistakes a Scottish grower can make. Two tonnes of grit for a small bed is not a purchase anyone makes twice.
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- RHSRoughly 250kg per sq m of grit needed; adding material can make clay less stable
“You have to dig the ground over each year to keep the soil fertile”
Digging works against fertility rather than for it. Turning the ground releases soil nitrogen and damages the soil's biology. The structure that fungi, worms and roots build up over a season is undone every time the spade goes through it.
What to do: Leave the ground alone and feed it from the top. Spread compost or well-rotted manure on the surface and let the soil life pull it down. Dig only where you actually need to, such as lifting root crops or clearing perennial weeds.
In Scotland: There is a practical bonus here: undug ground carries weight better and warms marginally earlier in spring than freshly turned wet soil, which matters when the season is already short.
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- RHSDigging releases soil nitrogen and damages soil biology
- RHSRecommends no-dig among the practical options for heavy ground
“Peat-free compost doesn't grow plants as well as the peat stuff”
This was a fair complaint a decade ago and it has not aged well. Peat-free quality has greatly improved in recent years, and dedicated research has found some carnivorous plants grow better in peat-free mixes than in peat. What is true is that peat-free behaves differently: the watering and feeding requirements are not the same, because the ingredients have different physical and chemical properties from peat.
Our read Most bad experiences with peat-free are a watering problem rather than a compost problem. It dries differently, so the habits you built on peat will let you down for a season until you adjust.
What to do: Read the bag rather than assuming, since feeding and watering advice genuinely varies between mixes. Buy fresh: old stock breaks down and performs worse regardless of what it is made of. If one brand disappoints, try another rather than writing off the category.
In Scotland: This matters more here than almost anywhere in Britain. Scotland holds a great deal of the UK's peat, those peatlands are major carbon stores, and peat-based compost comes out of them. The performance excuse for buying peat no longer holds up.
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- RHSQuality has greatly improved; own research shows some plants do better peat-free; watering and feeding requirements differ
“Plants do better in pots than in the ground”
A container limits how far roots can spread and cuts the plant off from the reservoir of moisture and nutrients that open ground provides, increasing the need for both watering and feeding. You are taking on work the soil would have done for free.
Our read Pots are a solution to a problem, not an upgrade: no ground, bad drainage, a crop that needs containing, or somewhere warm against a wall. Chosen for those reasons they are excellent. Chosen by default they make the job harder.
What to do: Use the ground where you have it. Where you do use pots, go bigger than feels necessary, expect to water far more often, and feed through the season because there is no soil reserve to draw on.
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- RHSPot planting causes limited root spread and increases the need for watering and feeding
“Strong-smelling plants confuse pests and hide your crop”
This is the theory underneath half of every companion planting chart, and it is the wrong mechanism. Research at Wellesbourne, Britain's long-standing centre for brassica and carrot pest work, found that insects hunting a host land on green and avoid bare brown soil. Colour, size and shape decide where they settle. Artificial green plants, and even green paper releasing nothing at all, disrupt them as well as living companions do, and aromatic plants perform no better than bland ones.
What to do: Stop choosing companions by scent. If ground cover is what disrupts the pest, the useful question is whether something low and green grows between your rows, not whether it smells of anything.
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- Warwick Crop CentreArtificial green plants and green paper are as effective as living companions; aromatic plants no better than less pungent species
“Crushed eggshells, bark mulch or wool pellets stop slugs”
Testing the most popular home slug barriers found no reduction in damage from crushed eggshells, bark mulch or wool pellets. This is Britain's most repeated slug advice and it does not work.
What to do: Skip the barrier. Nematodes, evening hand-collection, and raising plants to a decent size in modules before planting out all do more.
In Scotland: This one costs us more than most. A wet, mild climate is close to ideal for slugs, so a barrier that does nothing is a bigger loss here than in a dry southern garden where the pressure is lighter anyway.
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- RHSNo reduction in slug damage from these barriers
- Garden OrganicRecommends nematodes and hand-picking over physical barriers, which it does not endorse
“Watering in sunshine scorches the leaves”
Water droplets do not focus sunlight enough to burn foliage. Scorch on new plants comes from insufficient hardening off far more often.
What to do: Water whenever the plant needs it. Watering at ground level rather than over the leaves is still worth doing, but for disease and evaporation reasons, not for scorch.
In Scotland: Rarely the limiting factor here anyway, though it matters under cover, where watering habits drive humidity and therefore disease.
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- RHSScorching from lack of hardening off is far more common
“Coffee grounds acidify your soil and feed your plants”
Grounds do contain nitrogen, phosphorus, potassium and magnesium, so the feeding half is not baseless. The acidifying half is not: their effect on pH is very minor and temporary. Spread thick they cap the soil and block water and air, and residual caffeine can suppress root and shoot growth.
What to do: Put them in the compost bin rather than straight on the bed. If you actually need to change pH, that is a job for lime or sulphur guided by a soil test, not for coffee.
In Scotland: Most Scottish soils are naturally acidic already, so the acidifying claim solves a problem you probably do not have and may worsen one you do.
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- RHSEffect on pH is very minor and temporary; caffeine can suppress growth
- WSU Extension — Linda Chalker-Scott, WSU Extension Urban HorticulturistA commonly held assumption states that coffee grounds are acidic, but this does not hold true experimentally... the pH of decomposing coffee grounds is not stable and one shouldn't assume that it will always, or ever, be acidic.
“Squash and pumpkin seed need one fixed, universally agreed temperature to germinate”
RHS gives 18-21C for indoor sowing, on both its squash and pumpkin pages. Garden Organic states squash and pumpkins need soil at 13C to germinate, a genuinely lower figure for what all sources describe as the same pot-sowing method.
Our read A precise-sounding number like 18-21C reads as settled science, which makes the gap with Garden Organic's figure easy to miss unless you actually read both pages rather than one.
What to do: Treat 18-21C as the safer target if you're using a heated propagator, since it's the figure from the more detailed guides, but don't assume a cooler windowsill below that range guarantees failure either.
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- RHSKeep at 18-21C (65-70F) in a heated propagator
- Garden OrganicPumpkins and squash require a soil temperature of 13C to germinate
“Copper tape round your pots keeps slugs off”
Two authorities we trust reach opposite conclusions on Britain's most popular slug barrier. RHS ran its own research and found no reduction in slug damage from copper tape or sharp grit in garden conditions, and says plainly that many barrier methods have no scientific evidence behind them. Garden Organic calls copper tape the most effective barrier for container growing, though expensive, and reckons copper banding on pots tends to work well.
Our read The disagreement narrows once you look at where each was testing. RHS tested garden conditions; Garden Organic's endorsement is specifically about containers, where a continuous unbroken ring is actually achievable. If you are going to try it, pots are the only place it has a supporter.
What to do: Don't ring an open bed with it and expect much. On containers it is at least defensible, but check the tape stays unbroken and clean, and don't let a leaf bridge it. Nematodes remain the one control both authorities endorse.
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- RHSOwn research found no reduction in damage from copper tape or sharp grit
- Garden OrganicThe most effective barrier for container growing, though expensive
“Beer traps will deal with your slugs”
Beer traps are listed among trapping options but with no claim that they work, and we could find no trial data from either authority establishing how much difference they actually make.
Our read They certainly catch slugs, which is why gardeners believe in them, but a trap full of slugs is not the same as a bed with fewer. Beer also attracts slugs in, so a trap in the middle of a seedling bed may be drawing more traffic than it removes. If you use them, put them at the edges rather than among the plants.
What to do: Treat them as a way of seeing what you have rather than a control. Sink the rim above soil level so ground beetles, which eat slug eggs, don't drown in them.
In Scotland: Our wet weather fills and dilutes open traps quickly, so they need emptying more often here than the advice usually assumes.
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- RHSListed as a trapping option, with no effectiveness claim made
“Slug nematodes actually work”
This is the one slug control both our authorities endorse. The nematode Phasmarhabditis hermaphrodita is watered into moist soil between 5 and 20°C, spring to early autumn, with effectiveness lasting at least six weeks per application.
Our read Worth knowing before you buy: RHS points out it affects all slug species, including the ones doing useful work breaking down dead matter. That sits awkwardly beside the same organisation's advice to tolerate slugs where you can, and it is a reason to treat seedbeds rather than the whole plot.
What to do: Apply to moist soil once it has warmed past 5°C, and follow the watering instructions rather than treating it as a sprinkle. Garden Organic found control varies by crop, good on some and only intermediate on lettuce, so expect help rather than elimination. It is expensive, which is another argument for targeting it.
In Scotland: The soil temperature requirement is the catch here. In much of Scotland the ground does not hold above 5°C reliably until well into spring, which is later than the packet tends to imply and often after the first seedlings have gone in.
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- RHSMoist soil at 5-20°C, spring to early autumn; affects all slug species
- Garden OrganicEffective at least six weeks per application; control varies by crop; expensive
“Mulching is worth the effort”
This one earns its reputation. A layer of organic mulch conserves moisture, keeps the surface from cracking, suppresses weed germination by keeping light off the soil, and feeds the ground as it breaks down. It is worth doing directly for heavy soils, where it does more good than the grit people usually reach for.
What to do: Mulch onto ground that is already moist, not baked dry, or you seal the dryness in. Keep it clear of stems, and use compost, well-rotted manure or composted bark rather than anything that has not broken down.
In Scotland: Our rainfall means moisture retention matters less here than it does south, so the weed suppression and the slow feeding are the real prizes. On heavy ground a surface mulch also spares you digging wet soil, which does more harm than the weeds would.
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- RHSOrganic mulches around plants reduce cracking and conserve moisture
- RHSMulching saves water, suppresses weeds and improves soil structure
“Growing flowers among your plants brings in insects that eat the pests”
Hoverflies and lacewings eat aphids as larvae but live on nectar and pollen as adults, so a plot with nothing in flower starves the insects doing your pest control. UC IPM is clear that this works and equally clear about its limits: the benefit falls away with distance from the flowers, and it will not always show up as fewer pests.
Our read This is the one piece of companion-planting folklore that survives, and it survives because it works by feeding predators rather than by confusing pests with smells. Note what it is not: a guarantee, or a replacement for mesh where a pest is serious.
What to do: Put the flowers close among the crop rather than in a border at the far end of the plot, since the effect is local. Aim for something in flower across the whole season rather than one big flush.
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- UC IPMNectar and pollen sustain adult natural enemies; benefit declines with distance and may not always increase biological control
