Postbag Edition: Mary Berry's House
Peter Gibbs and the GQT panel visit the home of Dame Mary Berry and answer questions about black spot on evergreen roses, falling clematis and plants that peak in late summer.
Peter Gibbs and the GQT panel have traded parks and community gardens for a visit to the Oxfordshire home of Dame Mary Berry. On this week's panel are Matthew Pottage, Christine Walkden and Bunny Guinness.
Among today鈥檚 questions, the panellists troubleshoot evergreen roses plagued by black spot, unravel the mystery of why clematis keep failing on one side of a small London garden, and help a listener planning a late鈥慉ugust wedding by suggesting plants that peak at the tail end of summer.
Later in the programme, Mary shares her own gardening triumphs, from peaches ripened under winter covers, to treasured raised beds of herbs, strawberries and asparagus.
Producer: Dan Cocker
Assistant Producer: William Norton
Producer: Matt Smith
A Somethin' Else production for 麻豆社 Radio 4
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Plant List
Q1 鈥 My town garden is at its best in June and July, but my goddaughter wants her wedding reception here on August 31st鈥 what can I grow or add to make the garden look wonderful that late in the season? (03鈥40鈥)
Mary Berry
- Laurus nobilis, bay tree - 听with Erigeron karvinskianus, Mexican fleabane as underplanting
Bunny Guinness
- Lilium spp., lilies
- Cosmos spp., cosmos
- Salvia spp., salvias
- Lathyrus odoratus, sweet pea
Matthew Pottage
- Cleome hassleriana, 鈥橵iolet Queen鈥 spider flower
- Dahlia (single鈥慺lower forms)
- Thunbergia alata, black鈥慹yed Susan vine (modern cultivars in softer colours)
Christine Walkden
- Galtonia spp., summer hyacinths
- Gladiolus spp., gladioli
- Watsonia spp., watsonias
Q2 鈥 Several of my roses have become evergreen in recent years鈥 one climber keeps all its leaves and gets black spot. Should I just spray, or what should I do when the leaves don鈥檛 fall off anymore. (07鈥48鈥)
Mary Berry
- Rosa 鈥楥handos Beauty鈥, rose [Chandos Beauty]
Matthew Pottage
- Rosa banksiae 鈥楲utea鈥, double yellow Banksian rose
(Other advice focused on pruning, spacing, and hygiene)
Q3 鈥 One side of my small garden grows clematis beautifully, but the shadier, more acidic side keeps killing them. Should I lime the soil, use mushroom compost, or just give up? (11鈥37鈥)
Matthew pottage
路听听听听听听 Variegated climbing hydrangea suggested - Hydrangea听hydrangeoides, Japanese hydrangea vine
Q4 鈥 I leave a patch of nettles for butterflies, but when can I cut them back without harming their caterpillars? (14鈥37鈥 )
Q5 鈥 Do I really need to wash all my plastic pots every year? It would save so much time and water if I stopped鈥 (17鈥56鈥)
Q6 鈥 I have a 1 脳 1.5m raised bed in Copenhagen. What can I plant directly鈥攏o indoor sowing鈥攖o give me cut flowers throughout the year? (17鈥56鈥)
Bunny Guinness
- Convallaria majalis, lily of the valley
- Cosmos spp., cosmos
Matthew Pottage
- Nigella damascena, love鈥慽n鈥慳鈥憁ist
- Alstroemeria, Peruvian lily
- Alstroemeria听Indian Summer听('Tesronto'PBR)
(Summer Paradise - Summer Series), Peruvian
lily [Indian summer]
听
Q7 鈥 I鈥檝e planted three bare鈥憆oot yews and want to shape them into low, 90cm domes. Should I wait for them to spread before cutting the tops, or prune now to make them bushier? (26鈥51鈥)
Bunny Guinness
- Taxus baccata听'Renke's Kleiner Gr眉ner', yew 'Renke's Kleiner Gr眉ner' (Renke's Little Green)听
Q8 鈥 I grafted an apple 4鈥5 years ago and it鈥檚 now 1.2m tall in a pot. It鈥檚 never been pruned. Do I need to do formative pruning now, or is it too late? (32鈥37鈥)
- Malus domestica, apple
- Malus domestica 鈥楤ramley鈥檚 Seedling鈥, Bramley apple
Q9 鈥 We need a low hedge at the front of our house, but we have deer, rabbits, pigeons - and honey fungus. Is there anything we can plant? (36鈥14鈥)
Matthew Pottage
- Osmanthus 脳 burkwoodii, Burkwood osmanthus
- Osmanthus听脳听fortune, Fortune's osmanthus
General caution
- Prunus laurocerasus, cherry laurel 鈥 mentioned only as a honey鈥慺ungus鈥憇usceptible plant to avoid
Q10 鈥 听鈥淚 have acquired a new allotment, and the bindweed is like macaroni. I won鈥檛 use chemicals or plastic - how can I weaken it? (37鈥53鈥)
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Broadcast
- Sun 5 Apr 2026 14:00麻豆社 Radio 4
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Podcast
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Gardeners' Question Time
Horticultural programme featuring a group of gardening experts