IT HAS HAPPENED like Camelot clockwork: the winter is past, the zippity-do-da back. Again the annoucement comes: Introducing! another great season by Mother Nature - "a thing called spring, when the world is writting sonnets," or at least dusting off sills, throwing back the sash and letting blue jay noise float in on April air. The packet of petunia seeds is waiting to be poked into a special patch by small fingers; the old chaise lounge is waiting to be creaked outside; the sofa longing to celebrate with some nice new flowered pillows; the indoor plants hoping for a holiday on the front stoop.

But these are whispers and much more beckons - the great thumping of draperies (Wake up!), a grand thudding of hoe against crusted garden soil, the whiz of the air conditioner on a practice spin. The noise rises at last too much, bursting, yes, out all over, buds popcorning on every tree, grass growing too lickety-split for the rusted mower, the temperature rising too fast. "April love is for the very young." For Mother Nature and the rest of us, it's a busy month. We need to plant our garden. We need to revive our house.

In this year's annual Spring Home Design and Gardening issue, The Post's Living in Style editor Sarah Booth Controy takes a prism look at ways to bring sunshine indoors. For spring dreams, she presented some major remodeling ideas; for winter-worn budgets, dozens of inexpensive fresh home design alternatives.

Gardening expert Tom Zito makes it look as easy as dandelions in June in his beginner's guide to urban and suburban plots. If you act now, you can even send away for seed catalogs and have an eighty-pound pumpkin by Halloween - or a money crop of melons under the August moon.