The deck that eats furniture

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 30 moles of usable light a day with about 12 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, salt-tolerant coastal shrub is the one that actually belongs in conditions like these.

Growing-season light

30

mol/m²/day

April to September, averaged

Midsummer direct sun

12

hours

On 15 July, traced against the plan

Freeze-thaw

0

cycles a year

What cracks pots, not what kills plants

Light through the year

MonthLightDirect sunDries inReads as
Jan17.110 hnot that daypart shade
Feb21.89.5 hnot that daypart sun
Mar26.49 h8.8 hpart sun
Apr31.69.5 h7.5 hfull sun
May33.411.5 h7.4 hfull sun
Jun32.112 h8 hfull sun
Jul29.512 h8.3 hfull sun
Aug27.810.5 h8 hpart sun
Sep25.99.5 h8.3 hpart sun
Oct23.98.5 h9 hpart sun
Nov1910 hnot that daypart sun
Dec15.810.5 hnot that daypart shade

Screening

Salt-tolerant coastal shrub

belongs here

Salt air is a different problem from wind, and this is the group that solves both.

  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Light: About 30 moles a day, against an ideal of 30. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.

Watch for: Salt tolerance is specific. A plant that shrugs off wind inland can still burn in a coastal gale.

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

Contained clumping bamboo

belongs here

Fast, tall, evergreen screening, and the one plant most likely to become somebody else's problem.

  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Light: About 30 moles a day, against an ideal of 26. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.

Watch for: Only clumping species, and only with a root barrier. Running bamboo in a small garden is a decade-long regret.

Examples, not recommendations: Clumping Fargesia. What is right here is a question for a nursery that can see the site.

Large evergreen screening shrub

belongs here

Height and depth quickly, at the cost of the space it takes.

  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Light: About 30 moles a day, against an ideal of 26. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.

Watch for: These reach the height quickly and then keep going. Plan the maintenance, not just the planting.

Examples, not recommendations: Photinia; Viburnum tinus; Laurel where it is not invasive. What is right here is a question for a nursery that can see the site.

Broad evergreen hedge

belongs here

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

  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Light: About 30 moles a day, against an ideal of 24. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.

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

Deciduous climber for seasonal shade

belongs here

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

  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Light: About 30 moles a day, against an ideal of 30. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.

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.

Medium deciduous shade tree

will work

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

  • Hardiness: Zone 9.1 is outside this group's usual range of 4 to 9. Hardiness is a floor, not a plan.
  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Light: About 30 moles a day, against an ideal of 30. This is the right light band.

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.

Structure

Salt-tolerant coastal shrub

belongs here

Salt air is a different problem from wind, and this is the group that solves both.

  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Light: About 30 moles a day, against an ideal of 30. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.

Watch for: Salt tolerance is specific. A plant that shrugs off wind inland can still burn in a coastal gale.

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

Citrus in a container

belongs here

Wants a hot wall in summer and somewhere frost-free in winter, which makes it a decision about storage as much as position.

  • Moisture: This spot sits wetter than this group tolerates. Wet feet kill far more plants than cold does.
  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Light: About 30 moles a day, against an ideal of 32. This is the right light band.

Watch for: It is the winter that costs. Somewhere bright, frost-free and unheated is a harder brief than the summer position.

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

Large evergreen screening shrub

belongs here

Height and depth quickly, at the cost of the space it takes.

  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Light: About 30 moles a day, against an ideal of 26. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.

Watch for: These reach the height quickly and then keep going. Plan the maintenance, not just the planting.

Examples, not recommendations: Photinia; Viburnum tinus; Laurel where it is not invasive. What is right here is a question for a nursery that can see the site.

Mediterranean sub-shrub

belongs here

Built for hard sun, sharp drainage and being ignored.

  • Moisture: This spot sits wetter than this group tolerates. Wet feet kill far more plants than cold does.
  • Light: About 30 moles a day, against an ideal of 34. This is the right light band.
  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.

Watch for: Wet feet in winter kills these more reliably than cold does. Drainage, not hardiness, is the question.

Examples, not recommendations: Lavender; Rosemary; Cistus. 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.

  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Light: About 30 moles a day, against an ideal of 30. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.

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.

Succulent and sedum group

belongs here

For roofs, gravel and anywhere the answer to drainage is 'very'.

  • Moisture: This spot sits wetter than this group tolerates. Wet feet kill far more plants than cold does.
  • Light: About 30 moles a day, against an ideal of 36. This is the right light band.
  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.

Watch for: Winter wet is the killer, not winter cold. In a wet climate these need overhead cover as much as drainage.

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

Sedum and extensive green-roof matting

belongs here

The only group that will take a shallow, baking, exposed substrate and stay alive without watering.

  • Moisture: This spot sits wetter than this group tolerates. Wet feet kill far more plants than cold does.
  • Light: About 30 moles a day, against an ideal of 38. This is the right light band.
  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.

Watch for: It fails in shade, not in drought. Under an overhang or a parapet shadow it thins out and the substrate takes over.

Examples, not recommendations: Sedum album; Sedum spurium; Sempervivum in the gaps. What is right here is a question for a nursery that can see the site.

Rain garden and swale planting

will work

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

  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Hardiness: Zone 9.1 is outside this group's usual range of 3 to 9. Hardiness is a floor, not a plan.
  • Light: About 30 moles a day, against an ideal of 26. This is the right light band.

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.

Something to eat

Citrus in a container

belongs here

Wants a hot wall in summer and somewhere frost-free in winter, which makes it a decision about storage as much as position.

  • Moisture: This spot sits wetter than this group tolerates. Wet feet kill far more plants than cold does.
  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Light: About 30 moles a day, against an ideal of 32. This is the right light band.

Watch for: It is the winter that costs. Somewhere bright, frost-free and unheated is a harder brief than the summer position.

Examples, not recommendations: Lemon; Calamondin; Kumquat. 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: Moisture here sits inside what this group will accept.
  • Light: About 30 moles a day, against an ideal of 35. This is the right light band.
  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.

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.

Mediterranean sub-shrub

belongs here

Built for hard sun, sharp drainage and being ignored.

  • Moisture: This spot sits wetter than this group tolerates. Wet feet kill far more plants than cold does.
  • Light: About 30 moles a day, against an ideal of 34. This is the right light band.
  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.

Watch for: Wet feet in winter kills these more reliably than cold does. Drainage, not hardiness, is the question.

Examples, not recommendations: Lavender; Rosemary; Cistus. 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.

  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Light: About 30 moles a day, against an ideal of 38. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.

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

Seasonal container display

belongs here

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

  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Light: About 30 moles a day, against an ideal of 28. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.

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.

Citrus in a container

belongs here

Wants a hot wall in summer and somewhere frost-free in winter, which makes it a decision about storage as much as position.

  • Moisture: This spot sits wetter than this group tolerates. Wet feet kill far more plants than cold does.
  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Light: About 30 moles a day, against an ideal of 32. This is the right light band.

Watch for: It is the winter that costs. Somewhere bright, frost-free and unheated is a harder brief than the summer position.

Examples, not recommendations: Lemon; Calamondin; Kumquat. 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: Moisture here sits inside what this group will accept.
  • Light: About 30 moles a day, against an ideal of 35. This is the right light band.
  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.

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.

Contained clumping bamboo

belongs here

Fast, tall, evergreen screening, and the one plant most likely to become somebody else's problem.

  • Reflected heat: Surfaces here reach about 152°F. A container in that is a watering commitment, not a planting decision.
  • Light: About 30 moles a day, against an ideal of 26. This is the right light band.
  • Moisture: Moisture here sits inside what this group will accept.

Watch for: Only clumping species, and only with a root barrier. Running bamboo in a small garden is a decade-long regret.

Examples, not recommendations: Clumping Fargesia. What is right here is a question for a nursery that can see the site.

Other questions about this place