It comes down to experience and vigilance @Leeendean, and that takes a bit of time, so don't worry. The lupin will establish quite readily and grow, but the hydrangea will take a few months to get established, hence the need to water thoroughly. All shrubs are slower to establish than perennials due to their woody nature. The type of soil is a factor, just as much as temperature. In hot, dry or windy weather, soil dries more quickly, but a hefty, clay soil will take longer to dry out than a sandier one. The location of the plant is also a factor. Hydrangeas perform best in some shade, and that means they can be slower to dry out, but they need more moisture to start with, and don't like to dry out, whereas many other plants can cope with that.
Make sure they're good and moist before planting, as @JennyJ says.
I can often plant things here without watering them in. We have the opposite problem from the south east
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
Ahh thank you so much, and your right it’s definitely a learning curve.my soli seems like clay I done a test,I dug a whole filled it with water and within ten minutes the water was gone.the lupin is going In a full sun spot, the hydrangea is going in a spot we’re it has full sun and shade, so I know it will be alright there both have. Been well watered just waiting to plant them now. Once planted and watered I’ll give it another full can of water on Tuesday
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The lupin will establish quite readily and grow, but the hydrangea will take a few months to get established, hence the need to water thoroughly. All shrubs are slower to establish than perennials due to their woody nature.
The type of soil is a factor, just as much as temperature. In hot, dry or windy weather, soil dries more quickly, but a hefty, clay soil will take longer to dry out than a sandier one. The location of the plant is also a factor.
Hydrangeas perform best in some shade, and that means they can be slower to dry out, but they need more moisture to start with, and don't like to dry out, whereas many other plants can cope with that.
Make sure they're good and moist before planting, as @JennyJ says.
I can often plant things here without watering them in. We have the opposite problem from the south east
I live in west central Scotland - not where that photo is...