The hot tub that feels like a stage

What grows here?

Not full sun or shade. How much usable light actually arrives across a day, when it arrives, and whether the spot ever dries.

What this spot actually is

Bundled plant catalogue

About 29.4 moles of usable light a day with about 13 hours of direct sun in high summer. That is full sun, whatever the label on the plant says.

Of the groups in the reference set, shade-tolerant lawn or alternative is the one that actually belongs in conditions like these. Anything planted here sits wet for 8 months of the year, so drainage is the decision before the plant is.

Growing-season light

29.4

mol/m²/day

April to September, averaged

Midsummer direct sun

13

hours

On 15 July, traced against the plan

Freeze-thaw

83

cycles a year

What cracks pots, not what kills plants

Light through the year

MonthLightDirect sunDries inReads as
Jan87.5 hnot that dayshade
Feb12.97.5 hnot that daypart shade
Mar18.59 hnot that daypart sun
Apr25.311 hnot that daypart sun
May31.113 h11.3 hfull sun
Jun35.313 h9.6 hfull sun
Jul34.913 h8.8 hfull sun
Aug29.111.5 h10.3 hfull sun
Sep21.69.5 hnot that daypart sun
Oct14.47.5 hnot that daypart shade
Nov87.5 hnot that dayshade
Dec6.27 hnot that dayshade

Screening

Mixed native hedge

belongs here

The cheapest screening per metre and the best for everything that is not a person.

  • Light: About 29.4 moles a day, against an ideal of 28. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: Mixed hedges take four years to be a screen and want cutting once a year to stay one.

Examples, not recommendations: Regional native hedging mixes. What is right here is a question for a nursery that can see the site.

Deciduous hedge that holds its leaves

belongs here

Screens in summer, filters in winter, and holds brown leaves through the cold.

  • Light: About 29.4 moles a day, against an ideal of 26. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: Winter screening is partial. If the problem is a winter sightline, this is not the answer.

Examples, not recommendations: Beech; Hornbeam. What is right here is a question for a nursery that can see the site.

Narrow upright evergreen screen

wrong place

The classic answer to a sightline when there is no room for a hedge.

  • Hardiness: Zone 4.3 is outside this group's usual range of 5 to 9. Hardiness is a floor, not a plan.
  • Light: About 29.4 moles a day, against an ideal of 22. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
Winter minimums here are below what this group survives.

Watch for: Narrow forms lose their shape if the top is ever cut. Buy the mature height you want.

Examples, not recommendations: Columnar hornbeam; Italian cypress in mild dry climates; Upright yew in cool climates. What is right here is a question for a nursery that can see the site.

Broad evergreen hedge

wrong place

Dense all year, and it wants more width than people allow for.

  • Hardiness: Zone 4.3 is outside this group's usual range of 5 to 10. Hardiness is a floor, not a plan.
  • Light: About 29.4 moles a day, against an ideal of 24. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
Winter minimums here are below what this group survives.

Watch for: A hedge kept below its natural width thins at the base, which is exactly where a seated sightline runs.

Examples, not recommendations: Yew; Portuguese laurel; Holly. What is right here is a question for a nursery that can see the site.

Shade

Medium deciduous shade tree

belongs here

Summer shade that gives the winter sun back. The best shade device there is, and the slowest.

  • Light: About 29.4 moles a day, against an ideal of 30. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: Mature spread is the number that matters, and it is almost always larger than the space allowed.

Examples, not recommendations: Field maple; Serviceberry; Hop hornbeam. What is right here is a question for a nursery that can see the site.

Deciduous climber for seasonal shade

wrong place

Shade over a pergola in July and bare timber in January, which is usually exactly right.

  • Hardiness: Zone 4.3 is outside this group's usual range of 5 to 10. Hardiness is a floor, not a plan.
  • Light: About 29.4 moles a day, against an ideal of 30. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
Winter minimums here are below what this group survives.

Watch for: Wisteria in particular puts real load on a structure. Build for it before planting it.

Examples, not recommendations: Grape vine; Wisteria, given the structure for it; Virginia creeper. What is right here is a question for a nursery that can see the site.

Structure

Medium deciduous shade tree

belongs here

Summer shade that gives the winter sun back. The best shade device there is, and the slowest.

  • Light: About 29.4 moles a day, against an ideal of 30. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: Mature spread is the number that matters, and it is almost always larger than the space allowed.

Examples, not recommendations: Field maple; Serviceberry; Hop hornbeam. What is right here is a question for a nursery that can see the site.

Small ornamental tree

belongs here

Structure and a canopy edge without committing the whole garden to shade.

  • Light: About 29.4 moles a day, against an ideal of 28. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: Many small trees resent reflected heat off a wall far more than they resent full sun.

Examples, not recommendations: Crabapple; Japanese maple in sheltered positions; Redbud. What is right here is a question for a nursery that can see the site.

Wind-tolerant ornamental grass

belongs here

Movement instead of resistance, which is why these survive a balcony.

  • Light: About 29.4 moles a day, against an ideal of 30. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: Grasses in containers on a windy terrace dry out faster than anything else on the plot.

Examples, not recommendations: Miscanthus; Calamagrostis; Stipa. What is right here is a question for a nursery that can see the site.

Moisture-loving marginal

belongs here

For the corner that never dries, which most planting advice treats as a fault to fix.

  • Light: About 29.4 moles a day, against an ideal of 24. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: These want consistent moisture, not stagnant water. Standing water still needs solving.

Examples, not recommendations: Astilbe; Ligularia; Iris sibirica. What is right here is a question for a nursery that can see the site.

Ground cover

Shade-tolerant lawn or alternative

belongs here

The most common failed planting in any garden, usually because it was never a light problem people checked.

  • Light: About 29.4 moles a day, against an ideal of 30. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: Below about twelve moles a day, no grass mix holds. That is when a different ground cover is the answer, not more seed.

Examples, not recommendations: Fine fescue mixes; Clover and micro-clover blends; Moss, accepted rather than fought. What is right here is a question for a nursery that can see the site.

Rain garden and swale planting

belongs here

For ground that floods and then dries hard, which is a different problem from ground that is simply wet.

  • Light: About 29.4 moles a day, against an ideal of 26. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: The cycle is the point. Anything that only tolerates constant wet dies in the August between floods.

Examples, not recommendations: Iris in damp ground; Switchgrass; Joe Pye weed in North America. What is right here is a question for a nursery that can see the site.

Prairie and steppe perennial matrix

belongs here

Planted as a community rather than as specimens, and it wants full sun and poor soil.

  • Moisture: Moisture here sits inside what this group will accept.
  • Light: About 29.4 moles a day, against an ideal of 36. This is the right light band.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: Rich soil and shade both make it flop. It is a group that is ruined by kindness.

Examples, not recommendations: Echinacea; Little bluestem; Achillea. What is right here is a question for a nursery that can see the site.

Alpine and scree plants

belongs here

Built for thin, sharp-draining ground in hard light. Wet feet kill these long before cold does.

  • Moisture: This spot sits wetter than this group tolerates. Wet feet kill far more plants than cold does.
  • Light: About 29.4 moles a day, against an ideal of 34. This is the right light band.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: Almost nothing here is about temperature. Winter wet at the crown is what finishes them, so drainage beats hardiness every time.

Examples, not recommendations: Saxifrage; Sempervivum; Dianthus in gritty soil. What is right here is a question for a nursery that can see the site.

Something to eat

Soft fruit canes

belongs here

Reliable in less light than people expect, and destroyed by still, damp air.

  • Light: About 29.4 moles a day, against an ideal of 26. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: Airflow matters more than the last few moles of light. A still corner gives mildew every year whatever else is right.

Examples, not recommendations: Raspberry; Blackcurrant; Gooseberry. What is right here is a question for a nursery that can see the site.

Espaliered fruit on a warm wall

belongs here

The most productive use of a sunny wall there is, and it takes real commitment.

  • Light: About 29.4 moles a day, against an ideal of 34. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: This needs pruning twice a year, forever. Skipped for two seasons it becomes a shrub against a wall.

Examples, not recommendations: Apple; Pear; Fig in warm positions. What is right here is a question for a nursery that can see the site.

High-heat container herb

belongs here

Wants a hot wall, a lot of light and someone who waters it.

  • Moisture: This spot sits wetter than this group tolerates. Wet feet kill far more plants than cold does.
  • Light: About 29.4 moles a day, against an ideal of 35. This is the right light band.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: A container against a sunlit wall can run twenty degrees above air temperature. That is a watering problem, not a light problem.

Examples, not recommendations: Basil; Thyme in a deep pot; Oregano. What is right here is a question for a nursery that can see the site.

Fruiting vegetable

belongs here

The most light-hungry thing most people try to grow, and the one most often put in the wrong place.

  • Moisture: Moisture here sits inside what this group will accept.
  • Light: About 29.4 moles a day, against an ideal of 38. This is the right light band.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: Leaves grow at fifteen moles a day; fruit needs more than twenty. That gap is why people get plants and no crop.

Examples, not recommendations: Tomato; Pepper; Courgette. What is right here is a question for a nursery that can see the site.

In a container

Wind-tolerant ornamental grass

belongs here

Movement instead of resistance, which is why these survive a balcony.

  • Light: About 29.4 moles a day, against an ideal of 30. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: Grasses in containers on a windy terrace dry out faster than anything else on the plot.

Examples, not recommendations: Miscanthus; Calamagrostis; Stipa. What is right here is a question for a nursery that can see the site.

Seasonal container display

belongs here

Deliberately temporary, which makes it the right answer to an awkward spot.

  • Light: About 29.4 moles a day, against an ideal of 28. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: Daily watering in summer. If nobody will do that, this is a plan to buy plants and kill them.

Examples, not recommendations: Regional bedding for the season. What is right here is a question for a nursery that can see the site.

High-heat container herb

belongs here

Wants a hot wall, a lot of light and someone who waters it.

  • Moisture: This spot sits wetter than this group tolerates. Wet feet kill far more plants than cold does.
  • Light: About 29.4 moles a day, against an ideal of 35. This is the right light band.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: A container against a sunlit wall can run twenty degrees above air temperature. That is a watering problem, not a light problem.

Examples, not recommendations: Basil; Thyme in a deep pot; Oregano. What is right here is a question for a nursery that can see the site.

Fruiting vegetable

belongs here

The most light-hungry thing most people try to grow, and the one most often put in the wrong place.

  • Moisture: Moisture here sits inside what this group will accept.
  • Light: About 29.4 moles a day, against an ideal of 38. This is the right light band.
  • Reflected heat: Surface heat here is not the limiting factor.

Watch for: Leaves grow at fifteen moles a day; fruit needs more than twenty. That gap is why people get plants and no crop.

Examples, not recommendations: Tomato; Pepper; Courgette. What is right here is a question for a nursery that can see the site.

Other questions about this place