Gladiolus flanagranii
Johannes Ulrich Urban (Thu, 12 Dec 2019 14:52:23 PST)

Hello Gianni,

We had a discussion on this list on soil temperature in pots.  It was
sparked by a question why Pancratium maritimum would not flower and the
explanation was finally that the bulbs sit so very deep in their  native
habitat that they are protected from summer heat. And bulbs in pots
would become too hot.

Maybe the same applies to your Gladiolus. I do not grow it here in
Portugal but I had a rather unhappy plant of in in a pot in Germany.
Reading the comments of those who grow it in the UK or Ireland and
considering its native habitat it may simply become too hot in a pot in
Italy. Where in Italy do you garden? Shading the pot by standing it in
another bigger pot or using other plants to shade it might help, or
sinking it into the ground in a shaded place as cool as possible. But in
our mediterranean climates summer heat may be a limiting factor to grow
some plants.... There may also be a difference in soil temperature
between clay and plastic pots and between white or black plastic pots.

In my garden in Portugal there is a marked difference of several degrees
between the sune exposed side of the house and the shaded north side.
This is the only place where heat sensitive plants will survive in my
garden.

Hope that helps,

Uli

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