The dwarf varieties attain the height of five to eight inches only, and make admirable edging and bedding plants.  The taller strains range from one to two feet, and are handsome subjects for border and shrubbery work.  Both dwarf and tall sections are sufficiently brilliant and free-flowering to produce a beautiful display as pot plants in the greenhouse and conservatory.

For indoor decoration, the third week in January will be early enough to commence operations.  Two parts of leaf-mould, one of loam, and one of sharp sand, make an excellent soil for them.  Fill the pots or seed-pans within half an inch of the rim, and press the soil firmly down.  Sow thinly on an even surface, and cover the seed with almost pure sand.  Keep the pots or pans uniformly moist with a fine rose and a light hand, and in a temperature of about 60 deg..  Greater heat will render the seedlings weak and straggling.  From this condition it will take some skill and much time to redeem them; indeed, they may not produce a good display of flowers until the season is well-nigh over.  Just as the seed is germinating is a critical time for Petunias, and a little extra watchfulness then will be fully repaid.

In February the sun has not sufficient power to do mischief, so that shading is generally unnecessary.  An even temperature and freedom from draughts should insure seedlings strong enough to prick off by the end of that month.  Put the plants into seed-pans about an inch apart, so that the first leaves just touch the soil, still using a light compost.

In April they should be ready for transferring to small 60-pots.  Subsequently they must be potted on as growth demands, until they reach the 48-or even the 32-size.  After re-potting place the plants in a sheltered part of the house or frame, where shade can, if necessary, be given until the roots are established.  Frequent sprinklings of water, and a temperature of 60 deg. or 65 deg., will give them a vigorous start.  The lights ought to be put down in good time in the evening, but this must be done with judgment, or the plants will lose their healthy colour and assume a yellowish tinge.  Insufficient drainage has a precisely similar effect.  In about ten days air may be given more freely, and then no suitable opportunity of exposure should be lost.

In raising Petunias for bedding, the same conditions are applicable; but as it is useless to put them into the open ground until the weather is warm and settled, the sowing need not be made until the end of February or the beginning of March.  And for bedding there is no occasion to put the plants into larger pots than the 60-size.  It will be necessary to give these seedlings shade in their young state, after they have been pricked off or potted.

The beds or borders intended for Petunias will be better without recent manure, for this tends to the excessive production of foliage and defers the flowering until late in the season.  Do not be tempted by the first sunny day to put them out, but wait for settled weather.  A cutting east wind, such as we sometimes have in May, will ruin them irretrievably.  Each plant of the tall class will occupy a space of two feet, and the dwarfs may be one foot apart.