What to Grow in a Greenhouse in July (UK): The Ultimate Glasshouse Guide

Posted on 3rd July 2025
Uncategorised
Ripe strawberries on the plant

July is peak growing season in the UK — and your glass greenhouse is a powerful ally. While outdoor plots soak up the sunshine, your greenhouse offers a controlled haven for delicate crops, heat-loving vegetables, exotic fruits, and colourful flowers that might not otherwise thrive in the unpredictable British climate.

Whether you’re growing for food, fragrance, or floral displays, here’s your essential guide on what to grow in a glass greenhouse in July:
✅ 5 Vegetables
✅ 5 Fruits
✅ 5 Flowers (including one rare gem)
✅ 5 Other Useful Plants
Plus expert tips and trending hashtags to inspire your best greenhouse season yet!

🥕 5 Vegetables to Grow in a Glass Greenhouse in July

1. Tomatoes

A classic summer grower. If you started them in spring, July is the time for flowering and fruiting.

✅ Varieties: ‘Sungold’, ‘Gardener’s Delight’, ‘Ailsa Craig’, ‘Roma’, ‘Shirley’
Tips:

  • Remove side shoots from cordon varieties.
  • Water consistently to prevent blossom-end rot.
  • Feed with a high-potash fertiliser weekly.

#TomatoTime #GreenhouseGrowers #JuicyTomatoes

2. Cucumbers

Fast-growing and perfect for warm, humid greenhouses.

Cucumber growing in garden

✅ Varieties: ‘Carmen’, ‘Burpless Tasty Green’, ‘Marketmore’, ‘Mini Munch’, ‘Passandra’
Tips:

  • Train vertically to save space.
  • Mist the air to increase humidity.
  • Pick regularly for tender fruit.

#CucumberSeason #GrowYourOwnVeg #CrispAndFresh

3. Peppers

Sweet and spicy peppers love the July heat.

✅ Varieties: ‘California Wonder’, ‘Bellboy’, ‘Apache’, ‘Jalapeño’, ‘Numex Twilight’
Tips:

  • Provide stakes or cages to support heavy fruits.
  • Mist in the morning to boost humidity.
  • Harvest regularly to encourage new growth.

#PepperPower #ChilliChamps #HotHouseHarvest

4. Aubergines

Heat-lovers like aubergines flourish in July’s conditions.

✅ Varieties: ‘Black Beauty’, ‘Ophelia’, ‘Moneymaker’, ‘Bonica’, ‘Listada de Gandia’
Tips:

  • Use a soft brush to hand-pollinate flowers.
  • Stake plants as fruits grow.
  • Feed weekly with tomato feed once flowering.

#AubergineLove #MediterraneanMagic #GreenhouseGoals

5. Lettuce

Yes — even salad crops benefit from greenhouse protection, especially in cooler parts of the UK.

✅ Varieties: ‘Little Gem’, ‘Lollo Rosso’, ‘Tom Thumb’, ‘Salad Bowl’, ‘Oakleaf’
Tips:

  • Use shade netting to prevent bolting.
  • Harvest leaves regularly to prolong yield.
  • Sow every two weeks for succession.

#SaladDays #FreshGreens #LettuceGrow

🍓 5 Fruits to Grow in a Greenhouse in July

1. Strawberries

Extend the strawberry season by growing later varieties under glass.

Ripe strawberries on the plant

✅ Varieties: ‘Albion’, ‘Florence’, ‘Mara des Bois’, ‘Vibrant’, ‘Evie 2’
Tips:

  • Remove runners to concentrate energy on fruit.
  • Use hanging baskets or troughs to save space.
  • Water from the base to avoid mildew.

#StrawberrySeason #SweetSummer #GrowInGlass

2. Melons

July is ideal for fruit-setting if melons were sown in spring.

✅ Varieties: ‘Emir’, ‘Sweetheart’, ‘Ogen’, ‘Charentais’, ‘Alvaro’
Tips:

  • Hand-pollinate flowers using a soft brush.
  • Support growing fruit with netting slings.
  • Maintain steady moisture levels.

#MelonMadness #SummerFruits #GreenhouseMelons

3. Figs

Greenhouse figs do exceptionally well in pots.

✅ Varieties: ‘Brown Turkey’, ‘Rouge de Bordeaux’, ‘Brunswick’, ‘Violette de Bordeaux’, ‘Madeleine des Deux Saisons’
Tips:

  • Restrict roots for better fruiting.
  • Allow fruit to ripen fully on the tree.
  • Water moderately; figs dislike wet feet.

#FigTreeUK #TropicalVibes #FruitUnderGlass

4. Grapes

Grapes love the protected warmth of a greenhouse.

✅ Varieties: ‘Muscat of Alexandria’, ‘Phoenix’, ‘Lakemont’, ‘Flame Seedless’, ‘Black Hamburg’
Tips:

  • Prune laterals to focus energy on fruit.
  • Remove some leaves to let in light.
  • Ensure good airflow to prevent mildew.

#VineTime #GreenhouseGrapes #BritishWineDreams

5. Cape Gooseberries (Physalis)

A unique fruit that thrives in warm greenhouses.

✅ Varieties: ‘Giant Ground Cherry’, ‘Inca Berry’, ‘Aunt Molly’s’
Tips:

  • Train like tomatoes; treat as tender perennials.
  • Harvest when the papery husk turns golden.
  • Great for jams, tarts, and snacking!

#ExoticFruit #PhysalisPicks #GrowDifferent

🌸 5 Flowers to Grow in a Greenhouse in July

1. Petunias

Perfect for pots and hanging baskets with endless colour choices.

✅ Types: Grandiflora, Multiflora, Surfinia, Cascadia, Crazytunia
Tips:

  • Deadhead often to prolong flowering.
  • Water daily during hot spells.
  • Use liquid feed fortnightly.

#PetuniaPower #FlowerShow #SummerColour

2. Geraniums (Pelargoniums)

Classic greenhouse flowers known for their long blooming season.

✅ Varieties: ‘Rozanne’, ‘Patricia’, ‘Mavis Simpson’, ‘Vancouver Centennial’, ‘Tomcat’
Tips:

  • Pinch out tips for bushier growth.
  • Avoid overwatering to prevent rot.
  • Perfect for window boxes and pots.

#GeraniumGlow #BeddingBeauty #BloomsGalore

3. Marigolds

Bright and beneficial, marigolds deter pests.

✅ Varieties: ‘French Dwarf’, ‘Tagetes’, ‘Inca’, ‘Honeycomb’, ‘Lemon Gem’
Tips:

  • Plant near veg to deter whitefly.
  • Deadhead to keep blooms coming.
  • Loves full sun and regular watering.

#MarigoldMagic #CompanionPlanting #PestFreeGarden

4. Begonias

Shady greenhouse corners? Begonias thrive there!

✅ Varieties: ‘Non-Stop’, ‘Illumination’, ‘Fragrant Falls’, ‘Solenia’, ‘Double Cascade’
Tips:

  • Avoid direct overhead watering.
  • Feed with high-potash fertiliser.
  • Pinch faded flowers for fresh blooms.

#BegoniaBrilliance #ShadeLovers #GlasshouseGems

5. Schizanthus (Poor Man’s Orchid) – Unique & Unusual!

Add an exotic twist with this often-overlooked beauty, ideal for greenhouses.

✅ Varieties: ‘Angel Wings’, ‘Star Parade’, ‘Dr. Badger’, ‘Treasure Trove’, ‘Multicolor Mix’
Tips:

  • Prefers cooler summer conditions — perfect for ventilated greenhouses.
  • Produces orchid-like blooms in wild colours.
  • Feed weekly and keep soil moist.

#UniqueBlooms #Schizanthus #HiddenGreenhouseGem

🌿 5 Other Useful Plants to Grow in July

1. Basil

A greenhouse herb that loves heat and grows quickly.

Thriving basil plants in greenhouse with fragrant, lush leaves ready for harvest

✅ Varieties: ‘Genovese’, ‘Lemon Basil’, ‘Thai Basil’, ‘Purple Basil’, ‘Cinnamon’
Tips:

  • Harvest tips regularly to encourage bushiness.
  • Avoid letting it flower.
  • Keep in well-draining pots.

#BasilBoost #HerbGarden #GlasshouseGreens

2. Coriander

Great for late sowings and quick harvests.

✅ Varieties: ‘Leisure’, ‘Calypso’, ‘Slow Bolt’, ‘Confetti’, ‘Santo’
Tips:

  • Sow every 2–3 weeks for a constant supply.
  • Water well in hot spells.
  • Pinch flower heads to delay bolting.

#FreshHerbs #CorianderCrisp #KitchenGarden

3. Rocket (Arugula)

Spicy leaves that grow fast and harvest in under 30 days.

✅ Varieties: ‘Wild Rocket’, ‘Skyrocket’, ‘Dragons Tongue’, ‘Runway’, ‘Buzz’
Tips:

  • Provide shade during heatwaves.
  • Sow successively for ongoing harvests.
  • Pick leaves young for best flavour.

#RocketSalad #GrowFastEatFresh #UKGreenhouse

4. Chard

Attractive and edible — great for late sowing in July.

✅ Varieties: ‘Bright Lights’, ‘Fordhook Giant’, ‘Lucullus’, ‘Rainbow’, ‘Rhubarb Chard’
Tips:

  • Cut outer leaves and allow centre to regrow.
  • Tolerates partial shade.
  • Great for autumn harvests.

#ColourfulCrops #ChardCharm #GrowYourOwn

5. Calendula (Pot Marigold)

Edible petals, medicinal properties, and beautiful blooms.

✅ Varieties: ‘Indian Prince’, ‘Snow Princess’, ‘Golden Emperor’, ‘Fiesta Gitana’, ‘Art Shades’
Tips:

  • Pinch tips to encourage bushy growth.
  • Petals can be added to salads and teas.
  • Attracts beneficial insects.

#CalendulaCare #FlowerPower #HealingGarden

🌞 Greenhouse Maintenance Tips for July

  • Ventilation is key – open vents and doors daily to avoid overheating.
  • Shade cloths or blinds can prevent leaf scorch during heatwaves.
  • Dampen floors to increase humidity for tropical plants.
  • Watch for pests like red spider mites and whiteflies – use sticky traps.
  • Water regularly and consistently, especially during heat spells.

🌱 Final Thoughts

With the right planning, your glass greenhouse in July can be a hive of life, flavour, and colour. From exotic fruits to everyday veggies, bold flowers to aromatic herbs, it’s the perfect place to push your growing potential.

So go on — roll up your sleeves, grab your trowel, and let your greenhouse shine!

#UKGardeners #GreenhouseGlory #JulyGrowing #GlasshouseGarden #GrowYourOwnUk

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