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Advice for hydrangea.
Hi I received this hydrangea as a gift about 6 years ago.( sorry I can't remember the name)
The problem I have with it is it never seems to thrive or look it's best or get any bigger. ( it always stays about 1 1/2 foot tall)
I have got it situated on my banking at the back of my house which gets full sunlight all day. ( my soil is poor on the banking)
What advice can you give me so I get a thriving plant over the summer months.

The problem I have with it is it never seems to thrive or look it's best or get any bigger. ( it always stays about 1 1/2 foot tall)
I have got it situated on my banking at the back of my house which gets full sunlight all day. ( my soil is poor on the banking)
What advice can you give me so I get a thriving plant over the summer months.

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What colour were the flowers and what shape the flower head?
I ask because mopheads and lace caps flower on wood produced the previous season so if you're pruning that off every year or it's getting frozen to death you'll never get any flowers.
Paniculatas have bigger, cone shaped heads of flowers and produce them on new season's wood but need moisture and good soil to do well.
I planted two small Hydrangea three years ago both about 1 foot tall only. The lace-cap has flourised and flowers profusely more than doubling in size. The mop-head planted nearby (same light and soil type) has hardly grown and only produces a few flowers. My question is, is there a dwarf variety of mop-head, mine were gifts so I don't really know what I planted.
Luv Dave.
And the flowers are like in little clusters.
https://signaturehydrangeas.co.uk/hydrangea-macrophylla-doris-h-180-p.asp
Treated well it should flower next year and then it's best to leave the flower heads on all thru winter. They look attractive as they go over, fab in frost, and protect the new shoots form frosts and then you remove them in late winter, early spring.
Check out these two links for cultivation and pruning info. Scroll down to the mophead bits.
https://www.rhs.org.uk/advice/profile?pid=122
https://www.rhs.org.uk/advice/profile?pid=516