Hyacinthus orientalis cultivars
Jane McGary (Mon, 17 Mar 2014 19:12:41 PDT)

Lisa wrote

Some research (now) from the internet states that forced bulbs will not have
the same vigor as they did initially.
Why does forcing them affect them so drastically? Is there a way to
'recharge' the bulbs by planting in the ground for a year or so?
If I just grew them outside; only the rabbits would get to enjoy before they
ate them. :{
Any hope to maintain the wonderful color & scent in the greenhouse without
buying new bulbs every year?

First, rabbits will not eat the hyacinths. They are varmint-proof
plants, like daffodils
Second, it is not forcing itself that affects the hyacinths as Lisa
describes. They are just reverting to their normal appearance after
having been brought to what is commercially considered their peak of
perfection by special techniques used in the Dutch bulb trade.
Planted out in the garden (provided Lisa lives somewhere with
suitable seasonal temperatures), they will grow for many years and
increase a little, but the inflorescence will always be a little
looser than the "peak."

You can grow the same hyacinths year after year in the greenhouse,
provided you give them a suitable cold period, if they have plenty of
fertile, well-drained soil in a large, deep pot and full sun.
Hyacinths prepared for forcing have been put through warm and cold
periods to stimulate flowering. This is easy to do at home, so don't
spend money on prepared hyacinths unless you need them to flower for
Christmas. Also, you don't need to buy the premium size to grow in
pots -- the smaller size is fine.

At my former garden there are colonies of hyacinths that have been in
the ground for more than 20 years -- and there are many rabbits and deer there.

Jane McGary
Portland, Oregon, USA